A
A 1. Abbreviation for angstrom unit, used in expressing wavelength of light. Its length is 10–8 centimeter. 2. Chemical symbol for argon, an inert gas used in some electron tubes. 3. Letter symbol for area of a plane surface. 4. Letter symbol for ampere.
a Letter symbol for atto- (10–18).
A0 The Federal Communications Commission (FCC) designation for radio emission consisting solely of an unmodulated carrier.
A1 The FCC designation for radio emission consisting of a continuous-wave carrier keyed by telegraphy.
A-1 or A.1 The atomic time scale maintained by the U.S. Naval Observatory; presently it is based on weighted averages of frequencies from cesium-beam devices operated at a number of laboratories.
A2 The FCC designation for radio emission ...
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