What does UFD stand for?

What does UFD mean?

UFD	USB (Universal Serial Bus) Flash Drive Computing » Hardware
UFD	Usb Flash Drive Computing » Drivers
UFD	Utdannings- og ForskningsDepartementet Miscellaneous » Unclassified
UFD	Unreal Forum Deutschland Community » Sports
UFD	Unique Factorization Domain Academic & Science » Mathematics
UFD	Unión de Fuerzas Democráticas International » Spanish
UFD	Uniunea Fortelor De Dreapta Miscellaneous » Unclassified
UFD	User Functional Description Governmental » Military
UFD	Universal Firing Device Governmental » Military
UFD	UNIFLAME DutchOven Club Miscellaneous » Unclassified
UFD	Unidentified Flags and Ensigns Governmental » Military
UFD	Until Flames Die Internet » Chat
UFD	User File Directory Governmental » NASA