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U
U Thant
U-2
U2
uakari
UCAS
Uccello, Paolo
ud
Udmurt
Ufa
Uffizi
UFO
Uganda
Ugarit
UHF
UHT
UID
Uigur
Ujung Pandang
UK
ukiyo-e
Ukraine
Ukrainian
ukulele
Ulaanbaatar
Ulan Bator
ulcer
ulna
Ulster
Ulster Defence Association
Ulster Freedom Fighters
Ulster plantation
Ulster Unionist Party
Ulster Volunteer Force
Ultra
ultra-heat treatment
ultrasonics
ultrasound
ultrasound scanning
ultraviolet astronomy
ultraviolet radiation
Uluru
Ulysses
Umar
Umayyad dynasty
Umberto I
Umberto II
umbilical cord
umbra
umbrella bird
Umbria
Umm Durman
UN
uncertainty principle
Uncle Sam
unconformity
unconscious
underdevelopment
underground
Underground Railroad
undernourishment
underpainting
underpopulation
Underwood, Rory
unemployment
UNESCO
unfair dismissal
ungulate
UNHCR
Uniate Church
UNICEF
unicellular organism
unicorn
unidentified flying object
Unification Church
unified field theory
uniformitarianism
unilateralism
union flag
Union Movement
Union of Soviet Socialist Republics
Union, Acts of
unionism
UNISON
unit (quantity)
unit trust
UNITA
Unitarianism
unitary authority
United Arab Emirates
United Arab Republic
United Irishmen
United Kingdom
United Nations
United Provinces
United Reformed Church
United States art
United States literature
United States of America
universal
universal indicator
universal joint
Universal Serial Bus
universal suffrage
universe
university
Unix
unleaded petrol
Unrepresented Nations' and Peoples' Organization
unsaturated compound
untouchable
ununnilium
unununium
Unzen
Upanayana
Upanishad
Updike, John Hoyer
Uposatha
Upper Austria
Upper Normandy
Upper Volta
Uppsala (city)
Ur
Ural Mountains
Ural'skiy Khrebet
uraninite
uranium
uranium ore
Uranus (astronomy)
Uranus (mythology)
urban decay
urban development corporation
urban ecology
Urban II
urban land-use model
urban renewal
urban sprawl
Urban VIII, Maffeo Barberini
urbanization
Urdu language
urea
ureter
urethra
Urey, Harold Clayton
uric acid
urinary system
urine
URL
Urquiza, Justo José de
Ursa Major
Ursa Minor
urticaria
Uruguay
Urumqi
USA
usage
USB
user ID
user interface
Ushuaia
USSR
Ustaše
usury
Utah
Utamaro, Kitagawa
UTC
uterus
Uthman
Uthman I
utilitarianism
utility program
Utopia
Utrecht (province)
Utrecht, Treaty of
Utrecht, Union of
Utrillo, Maurice
Uttar Pradesh
Uttarakhand
UV
Uzbek
Uzbekistan

The ‘Sun of May’ was added in 1818. The blue bands are a shade known as ‘celeste’, said to be the colour of the sky which inspired Argentine revolutionary Manuel Belgrano before battle. Effective date: 16 August 1985. >>