- UAX-13(Unicode Standard AnneX 13, Unicode Newline Guidlines - Superceded by Unicode Standard Version 4.0)
- UAX-14(Unicode Standard AnneX 14, Line Breaking Properties)
- UAX-15(Unicode Standard AnneX 15, Unicode Normalization Forms)
- UAX-16(Unicode Standard AnneX 16, UTF- EBCDIC)
- UAX-17(Unicode Standard AnneX 17, Character Encoding Model)
- UAX-18(Unicode Standard AnneX 18, Unicode Regular Expression Guidelines)
- UAX-19(Unicode Standard AnneX 19, UTF-32 ( Superceded by Unicode Standard Version 4.0))
- UAX-2(Unicode Standard AnneX 2, Sinhala, Tibetan, Mongolian ( Superceded by Unicode Standard Version 3.0))
- UAX-27(Unicode Standard AnneX 27, UNICODE 3.1)
- UAX-3(Unicode Standard AnneX 3, Exploratory Proposals for Less Common Scripts ( Superceded by Unicode Standard Version 3.1))
- UAX-6(Unicode Standard AnneX 6, Standard Compression Scheme for Unicode)
- UAX-7(Unicode Standard AnneX 7, Plane 14 Characters for Language Tags ( Superceded by Unicode Standard Version 4.0))
- UAX-8(Unicode Standard AnneX 8, Unicode Standard Version 2.1 ( Superceded by Unicode Standard Version 4.0))
- UAX-9(Unicode standard AnneX 9)
- UAZ(Ultrasonically Assisted Z-fiber insertion)
- UB(Uniform Bill)
- UB-04(Uniform Billing Form, modified in 2004)
- UB1(Universal Barrel mount Type 1)
- UB-1(University weekly-produced hourly report)
- UB-2(University Bi-weekly-produced hourly report)
- UB5(Umpire Brush model 5)
- UB-92(Uniform Billing Form, modified in 1992)
- UBA(Mário de Almeida Franco Airport)
- UBACS(Under Body Armour Combat Shirt)
- UBB(Ultimate Bat Bag)
- UBC(United Baptist Church||University of British Columbia)
- UBD(User Brain Damage)
- UBE(Upper Band Edge)
- UBEC(Universal Basic Education Commission (Nigeria))
- UBER(Universal Binding Energy Relation)
- UBF(United By Fate)
