tube - unla
- tubed
- tunic
- turkey
- turnover
- turquoise
- tweeded colors
- two
- Umarex
- umbrella
- umbrella antenna
- unanimous
- unauthorized
- uncirculated
- underbid
- undercharge
- undercover operation
- underlever-cocking
- undersigned
- understanding
- undertake
- underwear
- underwrite
- undue advantage
- unenforceable
- unfair
- unforeseen
- uniform
- United Nations Convention Against Transnational Organized Crime (draft)
- United Nations Crime Prevention and Criminal Justice Fund
- United Nations Crime Prevention and Criminal Justice Programme
- United States Parachute Association
- universal forgery
- universal hash function family
- universal one-way hash function family
- unjust