
privately-operated advisory air-to-ground radio service at uncontrolled airfields, in the United States.
Found on
http://airodyssey.net/reference/glossary/

A UNICOM (Universal Communications) station is an air-ground communication facility operated by a non-air traffic control private agency to provide advisory service at uncontrolled aerodromes and airports and to provide various non-flight services, such as requesting a taxi, even at towered airports. It is also known as an Aeronautical Advisory St...
Found on
http://en.wikipedia.org/wiki/UNICOM

Universal Communication. A common radio frequency (usually 121.0 mHz) used at uncontrolled (non-tower) airports for local pilot communication.
Found on
http://www.aerofiles.com/glossary.html

Universal Integrated Communication (System)
Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.