UO
UO is used to refer to the lifestyle retailer Urban Outfitters, the long‑running MMORPG Ultima Online, and more generally to denote an unidentified or unknown object in informal or governmental contexts.
Medical
Miscellaneous
Unique Output
Uncensored Observations
Unknown Object
United Offensive
Umbrella Online
unoriginal
Ultimitaley Outstanding
Urban Outfitters
USRP overrun
Uh Oh
Universal Orlando
Upload Offers
Unspecified Object