முன்னொட்டுச் சுட்டி
- U-band
- U-boat
- U-shaped abutment
- U-shaped distribution
- U-shaped valley
- U-tube heat exchanger
- U-tube manometer
- U-turn
- U-value
- U.N.
- U. K.
- U5MR
- UAV
- UCB
- UCSD P-System
- UDA
- UDF
- UDISE
- UE
- UEG
- UEO
- UFF
- UFO
- UFT
- UG
- UGC
- UGF
- UHF (ultra high frequency)
- UI
- UIE
- UK
- UKP
- ULFA
- UMP
- UMR
- UN
- UN-HABITAT
- UN/CEFACT
- UN/ISDR
- UNAE
- UNAG
- UNAIDS
- UNAMID
- UNAMIR
- UNASG
- UNAVEM II
- UNAVEM III
- UNBA
- UNCDF
- UNCHR
- UNCITRAL
- UNCLOS
- UNCT
- UNDEF
- UNDESA
- UNDOF
- UNDP
- UNDSS
- UNECA
- UNECE
- UNEP
- UNESCO
- UNF
- UNFCCC
- UNFDAC
- UNFICYP
- UNFPA
- UNGASS
- UNGC
- UNHCHR
- UNHCR
- UNHRC
- UNIC
- UNICEF
- UNIDIR
- UNIDO
- UNIFEM
- UNIFIL
- UNIKOM
- UNIPTF
- UNIS
- UNIT
- UNITAR
- UNITY
- UNMIBH
- UNMIH
- UNMIK
- UNMIL
- UNMISET
- UNMIT
- UNMOGIP
- UNMOVIC
- UNNGLS
- UNO
- UNOB
- UNOG
- UNOMIG
- UNOMIL
- UNOMOZ
- UNOMSIL
- UNOPS
- UNOSOM
- UNP
- UNPA
- UNPAAERD
- UNPD
- UNPF
- UNPROFOR
- UNPSO
- UNRRA
- UNRRO
- UNRWA
- UNSA
- UNSC
- UNSCO
- UNSF
- UNSMIH
- UNT
- UNTAC
- UNTMIH
- UNTSO
- UNU
- UNWCC
- UNWFP
- UNWRA
- UNYU
- UN WSIS
- UOTC
- UP
- UPC
- UPD
- UPI
- UPX
- URL
- US
- USA
- USAID
- USCIS
- USDA
- USFU
- USFV
- USN
- USP
- US Virgin Islands
- UTC
- UU-UNO
- UUI
- UVA
- UVB
- UVC
- UV absorption
- UV absorption spectrophotometry
- UW
- UZN
- U constant
- Udi
- Udmurt
- Udupi
- Udupi district
- Uganda
- Ugaritic
- Ugric
- Ukraine
- Ukrainian
- Ukrainian SSR
- Ullatan
- Ulwa
- Ulysses spacemission
- Umblachery
- Umbrella Stone
- Umbundu
- Ume Sami
- Uncommitted
- Undistributed profits and reserves
- Unfollow
- Unilever Limited
- Union Carbide
- Union Ministry of Environment and Forests
- Union of Soviet Socialist Republics
- Unitarian
- Unitarianism
- United Arab Emirates
- United Kingdom
- United Kingdom of Great Britain
- United Kingdom of Great Britain and Ireland
- United Kingdom of Great Britain and Northern Ireland
- United Nations
- United Nations Environment Programme
- United Nations High Commissioner for Refugees
- United Nations Organization
- United States
- United States of America
- Universal Law
- Universology
- Unix operating system
- Unlicense
- Unschooling
- Unserdeutsch
- Upanishad
- Updater
- Updating
- Upper Sorbian
- Upper Volta
- UralAltaic
- Uran
- Uranus
- Urdu
- Urey-Miller hypothesis
- Ursa Major
- Ursa Minor
- Ursprache
- Uruguay
- Urugwaj
- Ute
- Uyghur
- Uzbek
- Uzbek SSR
- Uzbekistan