UNO United Nations Organization UN United Nations UMTS universal mobile telecommunications system uk, ukr Ukrainian UK, U.K The United Kingdom of Great Britain and Northern Ireland U uranium Tues., Tu Tuesday Ts tennessine tr, tur Turkish Tm thulium tl, tgl Tagalog Tl thallium TIFF tagged image file format Ti titanium Thurs., Th Thursday Th thorium Te tellurium TCP/IP transmission control protocol / Internet protocol TCP transmission control protocol Tc technetium Tb terbium Ta tantalum sw, swa Swahili SW south-west sv, swe Swedish