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T 1. Symbol for TRANSFORMER. 2. Abbreviation of
prefix TERA-. 3. Symbol for thermodynamic temperature.
4. Symbol for TRITIUM. 5. Abbreviation
of TON. (Also, t and tn.) 6. Abbreviation of TESLA.
7. Symbol for KINETIC ENERGY. 8. Symbol for
PERIOD. 9. Symbol for true.
t 1. Symbol for TIME. 2. Abbreviation of TON.
(Also, T and tn.) 3. Symbol for CELSIUS TEM-
PERATURE. (Also, T.) 4. Abbreviation of TARGET.
5. Abbreviation of technical. 6. Abbreviation of
TENSION.
Ta Symbol for TANTALUM.
tab On the keyboard for a computer, typewriter,
terminal, or word-processing system, a key that
moves the cursor a specified number of spaces
toward the right. It also performs various other
functions in menu-driven or graphical computer
interfaces.
table
In an internal or external computer memory,
an array (i.e., a list or matrix) of data that can
be recalled using keys (e.g., single- or doublesubscripted
variables).
table look-at Abbreviation, TLA. In computer operations,
finding the position of a data item in a
table by implementing an algorithm.
table look-up Abbreviation, TLU. In computer operations,
locating items in a table by inspecting
what is in the table, key by key.
tabulate In data processing, to combine the totals
for data item groups having the same key.
tabulation 1. The printout of what has been tabulated
(see TABULATE). 2. The computer-programdirected
movement of the cursor on a
cathode-ray-tube display, or of a typewriter carriage,
to certain positions in a line.
tabulator See TAB.
tacan A pulse-type UHF air navigation system in
which a station is interrogated by signals from an
aircraft to provide bearing and range information.
The name is an acronym for tactical air navigation.
tach Abbreviated form of tachometer.
tachometer See ELECTRONIC TACHOMETER.
tachometer generator A small, dynamo-type electric
generator that delivers a voltage proportional
to the rotational speed of a shaft to which it is attached.
tachyon A high-speed subatomic particle thought
to move faster than the speed of light.
tactical air navigation See TACAN.
tactical radar A radar system used in military operations.
tactile sensor A device that provides an intelligent
machine with a sense of “touch”: temperature,
pressure, force, texture, and torque. It is important
in robotics, and also in some computer applications,
such as virtual reality (VR).
T-adapter See TEE-JUNCTION.
tag 1. In data-processing and computer operations,
the identification of digits or characters
forming part of a record. 2. An encoded price tag
(i.e., a passive transponder or barcode strip). It is
commonly used in retail stores.
tag converter A device that senses the information
on tags (see TAG, 2) and transfers it to a computer
system.
tail 1. The decay of a waveform from maximum
amplitude to zero amplitude. 2. Any pulse that
follows a main pulse as a result of the main
pulse.
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