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L 1. Symbol for INDUCTANCE. 2. Symbol for
MEAN LIFE. 3. Abbreviation of LOW. 4. Resembling
the capital letter L in physical shape.
5. Symbol for LAPLACE TRANSFORM.
l 1. Symbol for LENGTH. 2. Abbreviation of LITER.
3. Subscript for LOW. 4. Abbreviation of LUMEN;
also abbreviated lm (preferred) and lum.
La Symbol for LANTHANUM.
label 1. A symbolic group of characters that identifies
an area of memory, an item of data, a file, or
a record. 2. A name assigned to a source program
instruction step to identify the step as a coding
entry point, or to make the step usable as a reference
point for entry to the routine or subroutine
in which it appears.
label group A collection of labels, usually of the
same type, held in an operating system.
label identifier Within a label, a character set
used to name the kind of item labeled.
label record A record identifying a file recorded
on a magnetic storage medium (e.g., magnetic
tape).
label set A collection of labels having a common label
identifier.
labile oscillator A frequency-controlled local oscillator.
laboratory conditions The environmental, mechanical,
and electrical parameters characteristic
of controlled conditions. Actual operating conditions
can be much different.
laboratory-grade instrument An instrument having
the high accuracy and stability that suit it to
precision measurements in a laboratory. Also
called PRECISION INSTRUMENT. Compare
SERVICE-TYPE INSTRUMENT.
laboratory power supply A regulated directcurrent
source whose adjustable output is less
than 10 kV at no more than 500 W.
laboratory standard See PRIMARY STANDARD
and SECONDARY STANDARD.
labyrinth speaker A loudspeaker whose enclosure
(a wooden cubicle) includes a folded pipe or
acoustic transmission line (behind the speaker);
the inner walls are lined with a sound-absorbent
material. When the pipe, which is open-ended, is
half as long as the wavelength of the frequency
being reproduced, the sound emerging from the
open end is in phase with that radiated by the
front of the speaker and, therefore, reinforces it.
laced wiring Circuit wiring in which wires or cables
run parallel in bundles that are tied together
with LACING CORD.
lacing cord Strong, sometimes waxed cord used to
tie together wires running parallel in a bundle.
Also see LACED WIRING.
lacquer disk See CELLULOSE-NITRATE DISK.
lacquer-film capacitor A fixed capacitor with a
plastic film dielectric; the film is applied as liquid
lacquer to the metal foil.
lacquer master A master recording made on a
CELLULOSE-NITRATE DISK.
lacquer original See LACQUER MASTER.
ladar Abbreviation of LASER DOPPLER RADAR.
Also abbreviated lopplar.
ladder attenuator See LADDER-TYPE ATTENUA-
TOR.
ladder filter A form of delay line or filter. It generally
consists of series and parallel impedances,
either in a balanced or unbalanced form.
ladder line See AIR-INSULATED LINE.
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