T T&V Test and Verification. T-Carrier An AT&T hierarchy of digital systems designed to carry speech and other signals in digital form, designated T1, T2, and T4. T.30 A fax routing standard that allows routing information to be passed along with message content. T.434 A binary file transfer standard that allows fax devices to send any file type, reproducing the original quality at the receiving end. T/R 1. Tip/Ring. 2. Transmit/receive. T/TAL Tandem Computers Transaction Application Language. T1 A 1.544M (in the USA and Japan) or 2.048M (elsewhere) bps bandwidth, data communications facility available in many versions, including: formatted Accunet, which is a formatted T1 offering that requires compliance with both AT&T DSX-1 hardware and DS1 software standards; and unformatted, which only requires compliance with the DSX-1 standard. (The formatted version provides less usable bandwidth. T1 link A wideband digital carrier facility used for transmitting digitized voice, digital data, and digitized image traffic; a T1 link is composed of two twisted-wire pairs that can carry 24 digital channels, each operating at 64K bps for an aggregate data rate of 1.544M bps, full duplex. Also referred to as DS-1. See also T- Carrier. T1C Transmission link capable of carrying 3.152M bps 48 voice conversations. T2 Transmission link capable of carrying 6.312M bps 96 voice conversations; four times the capacity of T1. T3 Transmission link capable or carrying 44.736M bps (45 megabits) or 672 voice conversations. T4 Transmission link capable of carrying 274.176M bps or 4032 voice conversations. table 1. In programming, a collection of adjacent fields. 2. In a relational database, a collection of records; same as a file. table lookup Searching for data in a table; commonly used in data entry validation and any operation that must match an item of data with a known set of values. table-driven Computer process where a variable is matched against an array of other variables and examined in order to provide access or authorization. Also used in least cost and network routing, access security and modem operation. tablet Input device, used with graphics and CAD/CAE/CAM programs, that allows the user to draw using a stylus or a puck. TACS See total access communications system. TAFAS See trunk access from any station. TAG Technical Advisory Group. tag Same as style tag. A code included in wordprocessed text that is interpreted by a desktop publishing software to control formatting, font size, style, etc. Tagged Image File Format A common bitmap file format for describing and storing color and grayscale images. See TIFF. tail Marker or flag that indicates the end of a list. TAL Terminal Application Language (Tandem Computers). talking battery Voltage provided by the CO to the subscriber's loop to operate the transmitter in the handset. talking path The tip and ring conductors in a telephone circuit. tandem A switching arrangement in which the trunk from the calling office is connected to a trunk to the called office through an intermediate point known as a tandem switching center. tandem data circuit Data path passing through more than two DCEs (Data circuit-terminating equipment) devices in series. tandem exchange Switching center on which inter-office or inter exchange circuits are terminated. tandem office A primary switching center for the switched telephone network which connects COs when direct interoffice trunks are unavailable. tandem switching Use of an intermediate switch to interconnect circuits from the switch of one CO to the switch of a second CO in the same exchange. tandem switching of tie trunks Connection between trunks are facilitated without attendant assistance or control. See also tandem switching. tandem switching system See tandem tie trunk network. tandem tie trunk network (TTTN) A serving arrangement that permits sequential connection of tie trunks between PBX/Centrex locations by utilizing tandem operation. tandem trunk service Incoming trunks are fed into outgoing trunks. tandem trunking Trunks that connect two or more switches together. tap An electrical connection on a LAN that permits signals to be transmitted onto or received from a bus. Typically, the LAN adapter housed in the system unit of a PC is cabled to a "T" connector that taps into the main bus of the LAN. tap 1. A touchscreen term. A tap of the finger registers in the software as a single mouse click. 2. In communications, a connection onto the main transmission medium of a local area network. tape A magnetic storage media. tape backup The use of magnetic tape for storing dupliate copies of hard disk files. tape drive A unit that transports, reads, and/or writes a magnetic tape. tape dump Printing out the raw contents of a tape storage with no attempt to format the output into reports. tape transport The part of the tape drive responsible for moving the tape over the read/write heads at the correct speed and tension. TAPI Telephony API. A programming interface from Microsoft and Intel that is part of Microsoft's WOSA architecture. Designed to provide interoperability between PCs and telephone equipment, TAPI lets Windows client applications access voice services on a server. TARGA Truevision Advanced Raster Graphics Adapter. A raster graphics file format developed by Truevision. It uses the .TGA file extension and handles 16-, 24-, and 32-bit color. tariff A document filed by a common carrier with the FCC that provides the technical specifications and price for a service. TAS See telephone answering service. TASI See time-assignment speech interpolation. task-to-task communications A program that exchanges messages with other users programs. TAT Translantic telephone cable. TAXI Transparent synchronous transmitter-receiver interface. TCAM See telecommunications access method. TCAM-IMS/VS Telecommunications Access Method-Information Management System/Virtual Storage (IBM). TCC See telecommunications common carrier. TCF 1. Terminal Configuration Facility. 2. Transaction Processing Facility (IBM). TCL Terminal Control Language (Pick). TCM Trellis coded modulation. TCP See transmission control protocol. TCP/IP See transmission control protocol/internet protocol. TDD See telecommunication device for the deaf. TDF (trunk distribution frame) See main distribution frame. TDM See time-division multiplexing. TDMA See time division multiple access. TDMS Technical Document Management System. TDOS Tape/Disk Operating System. TDR See time domain reflectometer. TEI See terminal equipment identifier. telco (telephone company) An industry-accepted abbreviation used when referring to telephone companies in general. telecommunication device for the deaf (TDD) A device that has a readout display, a typewriter style keyboard, and a telephone line connector or an acoustic coupler for a standard telephone handout. TDD users read and type messages over the telephone lines rather than talk and listen like hearing telephone users. telecommunication lines Any physical instrument used to transmit data from one location to another. Telecommunication Standardization Sector (TSS) Formerly called the CCITT standards committee. TSS is the international committee that sets standards for data communications devices. telecommunications Any transmission, emission, or reception of signs, signals, writings, images, sounds, or other form of communications by electromagnetic or visual means. telecommunications access method (TCAM) A method used to transfer data between main storage and remote or local terminals; eliminates delays for terminal input/output. telecommunications common carrier (TCC) See established common carrier. teleconferencing Use of computer networks for personal communications among widely dispersed groups of people. teledactyl Voice recognition equipment that can transcribe a human voice to written characters, and can also be combined with a telephone for the purposes of receiving remote dictation. telefax 1. European term for fax. 2. A high-speed, 64 kilobit per second facsimile service that uses Group 4 fax machines and one Bearer channel of an ISDN circuit, or any other 64 kbps circuit. telegraphy An outdated technology that electrically transmits messages and provides a written record of each message transferred. teleinformatics/telematics Term referring to the evolving significance of combining telecommunications and computing. telemetry Transmission of coded analog data, from a remote site. telephone A device that converts acoustical (sound) energy into electrical energy for transmission to a distant point. telephone answering service (TAS) Private service whose primary function is to answer calls and take messages for organizations and people. telephone channel Transmission pathway able to carry voice signals. telephone circuit Link allowing telephone communications in both directions between two telephone exchanges. telephone exchange Switching center that connects and switches telephone lines. telephone frequency Audio frequencies range required to transmit speech (300 to 3000Hz). telephone line See telephone circuit. telephone receiver That part of a telephone handset which converts electrical energy into sound. telephone set An instrument which, when connected to a telephone network, provides acoustic-to-electrical energy conversion and vice versa for the transmission of data. telephony Science of converting voices and other sounds into electrical signals which are then transmitted by telecommunications media. teleprinter A combination of a printer and typewriter-style keyboard used to provide sending and receiving facilities for a telegraph system. Also called teletypewriter (TTY). teleprocessing A form of information handling in which a data processing system uses communications facilities. (Originally, but no longer, an IBM trademark.) teletext ITU-TSS standard for text and message transmission which is replacing Telex. teletype grade The lowest type of communications circuit in terms of speed, cost, and accuracy. The term is used to distinguish between this type of service and voicegrade service. teletypewriter (TTY) A machine used to transmit and/or receive communications on printed page and/or tape. Teletypewriter exchange service (TWX) Western Union's domestic teletypewriter circuit-switched exchange service, providing subscribers with written records of their communications; a nationwide dial-up network for teletypewriter and low-speed business machines. Charges are per call. Telex Western Union's nationwide direct-dial subscriber-to subscriber automatic circuit-switching system providing a written record of communications using dial-equipped teleprinter equipment. telex II See TWX. Tellurium A metal often used in optical disks as the recording medium. TELNET (TELetype NETwork) ARPAnet's terminal-remote host protocol. It identifies a third version of the standard. See alsobis. telocator alphanumeric paging protocol (TAP) A 7-bit messaging protocol that enables someone sitting at a computer or terminal to send a message to a pager or beeper. template The programmatic and descriptive part of a programmable application. tenant service Individual customers share the same system using a shared or separate console. Also called multitenant sharing. ter Appended to a ITU-TSS network interface standard, terminal Any device capable of sending and/or receiving information over a communications channel, entering data into a computer system, and communicating the decisions of the system. terminal emulation Using special printed circuit boards mounted onto its motherboard and/or special software, a personal computer is able to mimic or imitate a data terminal. terminal equipment Devices, apparatus and their associated interfaces used to forward information to a local customer or distant terminal. terminal equipment identifier (TEI) Part of the layer 2 (LAPD) address that identifies frames to/from a particular terminal. terminal server A special purpose computer used to enablemultiple asynchronous terminals to communicate with host computers byconnecting over a network. terminal session See session. terminal user In time sharing, refers to anyone that is eligible to log on. termination 1. An item that is connected to the terminal of a circuit or equipment. 2. An impedance connected to the end of a circuit being tested. 3. The points on a switching network to which a trunk or line may be attached. terminator A connector used on both ends of an Ethernet Segment that provides 50-ohm termination resistance needed for the cable. test center Facility that contains equipment designed to detect and diagnose problems with communications lines and related equipment. test data generator Communications instructions that create data to tests the adequate operation of a system. text Words, sentences, and paragraphs. May also refer to alphnumeric data, such as name and address, to distinguish it from numeric data such as quantity and dollar amounts. text management All the techniques and technologies involved in creating, storing, and retrieving text files in an organized and logical manner. text-based Representation of images that requires the use of preexisting characters rather than vector or raster graphic techniques. texture mapping The creation of a special surface. A two-dimensional image (such as a PICT file) is applied to the surface of an object. TFTP See trivial file transfer protocol. TGB Trunk group busy. TGW Trunk group warning. thermal wax A printing technique which uses page-sized rectangles of colored wax. A heating element in the printer melts tiny droplets of wax, which are transferred to the paper. thick Ethernet cable 50-ohm coaxial cable, with a diameter of 10 millimeters. thin Ethernet A lighter (0.2 diameter, black coating) variation of Ethernet cable that conserves cable and installation costs, but limits effective distance. This type of cabling is specified under the IEEE 802.3 10Base-2 standard. third-party maintenance See service organizations. threads An individual process within an application. three-way conference transfer While on a two-party call, a station user can initiate a three-way conference or transfer by using the flashhook. threshold A predefined level set into a scanner's software to determine whether a pixel will be represented as black or white. through dialing The attendant can select an outgoing trunk and connect the extension to the trunk to allow the call to be completed by the extension. throughput Measurement of the amount of activity a computer system can accomplish in a given time period. thumbnail A miniature representation of a page or a image. TIC Token ring interface coupler. TIC Token-ring interface coupler. tie line A private line communications channel provided by common carriers for linking two or more points. tie trunk A trunk between two private automatic branch exchanges (PBXs). tie trunk access Method of controlling entry to tie lines by either dialing a trunk group access code or going through the attendant. TIFF Tagged Image File Format. TIGA Texas Instruments Graphics Architecture. A graphics standard from Texas Instruments that provides a resolution-independent interface between a program and the graphics coprocessor. tiling Reproducing oversize artwork or documents by breaking the image area into parts (called tiles). time division multiple access (TDMA) Satellite communication technique that combines many conversations to provide concurrent conversations onto one transponder. TDMA separates a radio frequency and then assigns every sixth signal to a particular telephone conversation. time domain reflectometer (TDR) A testing device that acts on radar-like principles to determine the location of metallic circuit faults. time slice A segment of time allotted to a certain function, task, or terminal job. time-assignment speech interpolation (TASI) Multiplexing procedure primarily used in overseas and long distance transmission; maintains a connection while conversation is taking place but allows other conversations to access the line during silent periods. In other words, during a conversation, only one person speaks at one time, the other person is listening. TASI uses the listening part of the transmission and efficiently uses that silence for other data transmissions. See also clipping. time-division multiplexing (TDM) A transmission system in which characters or bits belonging to different messages are transmitted at successive times on the same channel. time-division switching A switching method whereby the information content of each incoming time slot may be delayed in time and switched to any of a number of outgoing time slots. The switching of inlets to outlets using time division multiplexing techniques. time-out Time interval hardware or software is allocated for an expected event; if the event does not occur (e.g., if a caller does not dial within a prescribed period of time or does not log on to a terminal within a determined period), the system terminates usage (i.e., hangs up or logs off). timed recall See attendant timed recall. TIMESHARE Operating system (Control Data). timesharing The sharing of equipment among several processes, bygiving each access to the equipment in turn; usually applied toprocessor time. TDM is also a form of time-sharing. TIMS 1. Transmission impairment measurement tests. 2. Text Information Management System. Same as full-text retrieval system. TIP 1. Terminal Interface Program. 2. Transaction Interface Package (Unisys). tip and ring The standard termination on the two conductors of a telephone circuit; named after the physical appearance of the contact areas on the jack plug. TLF Trunk link frame (crossbar switching). TLP (transmission level point) A specification, in dB, of the relative level at a particular point in a transmission system as referred to a zero transmission level point. TMIC Token ring master interface card. TMRS See traffic measurement and recording systems. toggle Any device having two stable states. token A byte or packet that constantly circulates throughout the network, to obtain network access rights. token bus LAN access mechanism in which all stations attached to the bus listen for a broadcast token. Stations requesting transmission must receive the token before doing so. token passing A network access method that uses a distinctive character sequence as a symbol (token), which is passed from node to node indicating when to begin transmission. Any node can remove the token, begin transmission, and replace the token when it is finished. Compare with CSMA. token ring A LAN architecture that connects stations in a closed loop and grants permission to send by circulating a token that users may acquire and replace with a message. token ring extended user interface (TOKREUI) A direct interface to the link protocol of IBM's Token Ring Network. Some token ring software products use TOKREUI and some competitive LANs provide TOKREUI compatibility. token ring network 1. A LAN access method that uses the toek passing technology in a physical ring. 2. A LAN access method from IBM that conforms to the IEEE 802.5 token ring standard. token-ring A LAN architecture that connects stations in a closed loop and grants permission to send by circulating a token that users may acquire and replace with a message. token-ring extended user interface (TOKREUI) A direct interface to the link protocol of IBM's Token-Ring Network. Some token-ring software products use TOKREUI and some competitive LANs provide TOKREUI compatibility. token-ring topology Requires that each LAN terminal possess a "token", a byte or packet that constantly circulates throughout the network, to obtain network access rights. TOKREUI See token ring extended user interface. toll call Any call to a point outside the local service area. toll center A central office where operators (human or mechanical) are present to assist in completing incoming toll calls. toll connecting trunk Trunk utilized to link a local central office (Class 5) to the direct distance dialing network. toll office A center for switching toll calls. toll plant The facilities that connect toll offices throughout the country. toll restriction A restriction in outgoing trunks that counts the first three digits dialed and diverts calls to forbidden codes to a busy tone, to the operator, or to a recorded announcement. toll ticketing A PBX feature that provides a list of all toll calls by station. tone ringing Mechanical or electronic noise the telephone makes to signal an incoming call. tone signaling Transmission of signals (supervisory, address, or alerting), over a telephone path by means of typically in-band tones. tone-to-dial-pulse conversion When trunks carrying outgoing calls are unequipped to receive tone signals, this process converts pushbutton dialing signals into rotary dialing signals. toner Electrically-charged ink powder used in printers, fax machines, and copiers. tooth The amount of roughness in a paper that allows it to absorb ink. TOP Technical and Office Protocol; a set of standards specific to office automation products. Some TOP protocols reflect the OSI reference model. topology The geometric or physical configuration of a network. TOPS Operating system (Digital Equipment). TOS Tape Operating System (IBM). total access communications system (TACS) U.K.'s version of AT&T's AMPS (advanced mobile phone service), a cellular radio system providing mobile telephone service. touch sensitive Switches that can be activated by simply touching their surfaces. Touch-tone AT&T trademark for pushbutton dialing. See DTMF. touch-tone adapter A device that can be connected to a rotary dial telephone to allow for DTMF signaling. TP Transaction Processing. TPF Transaction Processing Facility. TPS 1. Transaction Processing System. 2. Tape ProgrammingSystem (IBM). 3. Terminal Polling System (TI). 4. transactions per second. trace packet Packet in a packet-switching network that operates as normal packet, but transmits a report of each of its progress stages to the network control center. track The path which is to be followed by the read head or beam during the magnetic or optical reading of a disk or disk; or the path to be followed by the recording head or beam during the writing of a disk or disk. tracking servo The mechanism in an optical drive which senses and adjusts for variations in movement of the recording area (the groove) of a track, caused by imperfections in the medium or the drive mechanism. tracking, telemetry, control, and monitoring (TTC& Ground stations that track, control and monitor satellites and their performances. tractor feed Continuous-form paper that has holes that are engaged by pegs or sprockets which move the paper across the platen. traffic 1. The messages sent and received over a communications channel. 2. A quantitative measurement of the total messages and their length, expressed in hundred call seconds (CCS) or other units. traffic capacity The maximum traffic per unit that can be carried by a specified telecommunications system, subsystem, or device under specified conditions. traffic data to customer Polling PBXs to obtain a traffic measurements and subsequent related reports. traffic flow Erlang expression obtained by dividing the amount of traffic by the duration of the observation. traffic measurement and recording systems (TMRS) A computer generated report showing usage information of telephone systems. This generally includes trunk utilization, outages, queuing time, and the need for additional common equipment. traffic monitor A PBX feature that provides basic statistics on the amount of traffic handled by the system. traffic overflow Condition resulting when traffic flow exceeds the capacity of a specific trunk group and is routed over to another trunk group. traffic service position system (TSPS) A toll switchboard position configured as a push-button console. training 1. Teaching the details of a subject. 2. In communications, the process by which two modems determine the correct protocols and transmission speeds to use. 3. In voice recognition systems, the recording of the user's voice in order to provide samples and patterns for recognizing that voice. 4. In OCR, an adaptive, interactive method for recognizing printed characters. transaction file File containing a collection of records detailing completed events assembled in chronological order. transceiver A combination of transmitting and receiving equipment in one housing, usually for portable or mobile use. transducer A device that converts signals from one form to another. transfer Telephone system feature that allows a call to be moved from one location to another, usually by pressing a button or series of buttons on the telephone keypad, or performing a switchook operation. transfer of incoming call Outdated PBX feature that requires the attendant to transfer all in-house calls. transfer rate Speed of data transmission between devices. translation Changes made by the network to a dialed number to permit the call to progress through the network (i.e., conversion of the area and office codes of a telephone number into routing instructions). translator In telephone equipment, the device that converts dialed digits into call-routine information. transmission The electrical transfer of a signal, message or other form from one location to another without unacceptable loss of information content due to attenuation, distortion, or noise. transmission control protocol (TCP) One of the components of TCP/IP that provides routing among networks and, in some cases, within a particular network. transmission control protocol/internet protocol (TCP/IP) An implementation of the middle levels of the ISO reference model that provides connection and message routing. transmission level The level of power of a signal, generally 1000 Hz, which should be measured at a particular reference point. transmission media The material used for transmitting data, such as microwaves, radio, and broadband or baseband coaxial cable. transmission speed Number of pulses or bits transmitted in a given period of time, usually expressed as bits per second (bps) or words per minute (wpm). transparency/opacity A setting available in many image-processing functions that allows part of the underlying image to show through. transparent LAN interconnect services Transparent LAN interconnect services typically deliver native LAN interfaces, such as Ethernet, token-ring or FDDI, to the customer premises, allowing users to directly connect LANs to carrier-provided and, managed CPE. transparent mode A transmission technique that places no restrictions on the format of user data. Compare with non- transparent mode. transponder A receiver-transmitter combination that retransmits the received signal at a greater amplification and at a different frequency. transport layer Layer 4 of the OSI reference model that is partially responsible for the start-to-finish management of transmitted information and the efficiency of network resources. transportable A cellular car telephone that is mounted or built into a carrying case. Most transportables are more powerful and heavier than the portable telephone. traveling class mark (TCM) Code that accompanies a long distance call used for indicating the restriction level associated with the call. tree A network topology that resembles a branching tree, and is distinguished by the having only one path between any two network nodes. trichromatic The technical name for RGB representation of color, i.e., using red, green, and blue to create all the colors in the spectrum. trigger circuit A circuit that has a number of stable states or unstable states, at least one being stable, and designed so that a desired transition can be initiated by the application of a suitable pulse. trivial file transfer protocol (TFTP) A protocol used by BOOTP and X terminals to send and receive control information. TROPIC Token-Ring Protocol Interface Controller (National Semiconductor IBM DP8025). TRT Token rotation time. TrueType fonts A scalable font technology that renders fonts for both the printer and the screen. Each TrueType font contains its own algorithms for converting the outline into bitmaps. truncation When either the beginning or end of a string of data is deleted or omitted. trunk Cables that contain numerous shared telephone circuits that are used to interconnect telephone switching centers. trunk access See miscellaneous trunk access. trunk access from any station (TAFAS) Capability of all stations to access the various trunks in a PBX system. trunk circuit A network of circuit elements used to connect a switching center to one of its associated trunks. Trunks usually perform various control functions associated with call processing. trunk code Digit or digits which distinguish a specific numbering area within the country. trunk exchange Switching center used mainly for interconnecting trunks. trunk group A group of trunks (between the same two points) that are electrically similar and used interchangeably. trunk group warning A lamp or other indication which activates and alerts the attendant when trunks within a trunk group are busy. trunk hunting The act of automatically searching for an idle trunk. trunk prefix Digit or digits that must be dialed before a telephone number in order to place a call within a different area code. trunk queuing A feature that allows the user to queue for a trunk when all trunks are busy; queuing ensure automatic connection at the first availability. See also queuing. trunk reservation Feature that enables an attendant to withhold a single trunk within the group for a single user. trunk restriction Feature where the use of a trunk is limited or made unavailable to certain users. trunk type (TT) Trunks that use the same type of equipment going to the same terminating location. trunk utilization report (TUR) A computer printout detailing the traffic use of a trunk. trunk verification by station (TVS) Provides a warning tone if a telephone user enters a busy trunk. trunk, foreign exchange (FX) A trunk connecting a PBX to a central office other than its normal serving central office. trunk, one-way A trunk used for calls from one end only. At the originating end, the one-way trunk is known as an outgoing trunk; at the other end, it is known as an incoming trunk. trunk, two way A trunk used for calls that originate from either end. trunk-to-tie trunk connections Switching system's ability to supply an attendant with the option of offering an incoming trunk call to a tie trunk which ends in a different location. TSOS Time-Sharing Operating System. TSP See twisted shield pair wire. TSPS See traffic service position system. TSS 1. Time-Sharing System. 2. See Telecommunication Standardization Sector. TTL Transistor-to-Transistor Logic. TTTN See tandem tie trunk network. TTY See teletypewriter. tumble duplex Printing both sides of a sheet so that the top of one side is at the bottom of the other. TUR See trunk utilization report. turnaround time Time requisite to reverse the direction of transmission on a half-duplex circuit. turnkey system A ready to operate system supplied by a vendor, including software and hardware which has been assembled and installed. TVRO Television receive only (antennas). TVS (Trunk verification by station) Provides a warning tone if a telephone user enters a busy trunk. TWAIN An evolving standard for crossplatform, multi-manufacturer scanner-to-software communications. Meant to eliminate separate software drivers for every program and every scanner brand. twinaxial cable A shielded coaxial cable with two central conductors. twisted pair (TP) or twisted shielded-pair (TSP) w Insulated 18- to 26-gauge wire (e.g., telephone cables) in which pairs are twisted together to break the lines of flux that would induce EMF (electro- motive force) signals in adjacent pairs because of the flow of electrical current. two-way splitting User is able to consult privately with either an internal or external party on a conference call. two-wire circuit See circuit, two-wire. TWX (teletypewriter exchange service) Western Union's domestic teletypewriter circuit-switched exchange service, providing subscribers with written records of their communications; a nationwide dial-up network for teletypewriter and low-speed business machines. Charges are per call. TXC or TXK Telephone exchange, crossbar. See crossbar switch. TXD Telephone exchange, digital. TXE Telephone exchange, electronic. type face Describes the design of a set of characters. type font Same as font. A set of characters of a particular design (typeface), size (point size), and weight (light, medium, heavy). type spec The attributes of a block of typesetting - the size, font, width, leading, alignment.