What does UFO stand for?

UHF- Ultra High Frequency Follow-On Satellite System - Satellite communications (MLEX)

Ultralight Flight Organization (EA)

Unfiltered Oil (SAUS)

Unflagged Order - Laboratory science (DAVI)

Unforeseen Obstacle (SAUS)

Unidentified Falling Object - Internet lingo (CHAT)

Unidentified Flying Object - "Flying saucers" - Facetious translation: "Undue Fuss Over"

Unidentified Foreign Object - Medicine (DAVI)

Uniform Field Organization - DoD

United 510 Owners (EA)

United Filipinos Onward (EARSL)

United Functions and Objects (SAUS)

Unit Families Officer - Military - British

Universal Fiber Optic (MCD)

Unknown Flying Object (SAUS)

Unlimited Freak-Out - Slang (DSUE)

Unwanted Falling Objects (MCD)

User Files On-Line - Computer science (MHDI)

User Friendly Operating System - UFO Systems, Inc.

User level File Organizer - A global filesystem

Users Files on Line (IAA)