| Abbreviation | Definition |
|---|---|
| UAX-13 | Unicode Standard AnneX 13, Unicode Newline Guidlines - Superceded by Unicode Standard Version 4.0 |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| UAX-19 | Unicode Standard AnneX 19, UTF-32 ( Superceded by Unicode Standard Version 4.0) |
| UAX-2 | Unicode Standard AnneX 2, Sinhala, Tibetan, Mongolian ( Superceded by Unicode Standard Version 3.0) |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| UAX-3 | Unicode Standard AnneX 3, Exploratory Proposals for Less Common Scripts ( Superceded by Unicode Standard Version 3.1) |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| UAX-7 | Unicode Standard AnneX 7, Plane 14 Characters for Language Tags ( Superceded by Unicode Standard Version 4.0) |
| UAX-8 | Unicode Standard AnneX 8, Unicode Standard Version 2.1 ( Superceded by Unicode Standard Version 4.0) |
| UBC | Unified Buffer Cache |
| UBD | User Brain Damage |
| UBE | Unsolicited Bulk E-Mail |
| UBF | Universal Binary Format |
| UBQ | Ubiquitous |
| UBS | Unit Backspace |
| UBS | User Business Standard |