Universal communications, a secondary function of some CTAF frequencies
USG
US gallon ...
UNICOM (Universal Communication) A common radio frequency (usually 121.0 mHz) used at controlled (non-tower) airports for local pilot communication.
AOPA coined the term (derived from the words "universal communications") in the 1950s. UNICOM is also used by a Fixed Base Operator for general administrative uses, including fuel orders, parking instructions, etc. Originally 122.
Uniform - Reference to UHF Frequency Band
UHF - Ultra High Frequency
UNICOM - Universal Communication
UTC - Universal Co-ordinated Time ...
At the roughly 18,000 airports without control towers (or when the tower is closed), pilots use a pre-assigned UNICOM (universal communications) frequency to communicate with each other and the people at the airport.
 See also: Broadcast, UNICOM, Aircraft, Speed, Air traffic
  
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