Editing Unicode (section)

=== Abstract characters <span class="anchor" id="Alias"></span>===
{{Further|Universal Character Set characters#Characters, grapheme clusters and glyphs}}
The set of graphic and format characters defined by Unicode does not correspond directly to the repertoire of ''abstract characters'' representable under Unicode. Unicode encodes characters by associating an abstract character with a particular code point.<ref>{{Cite web |title=Unicode Character Encoding Model |url=https://unicode.org/reports/tr17/ |access-date=12 September 2023}}</ref> However, not all abstract characters are encoded as a single Unicode character, and some abstract characters may be represented in Unicode by a sequence of two or more characters. For example, a Latin small letter "i" with an [[ogonek]], a [[dot above]], and an [[acute accent]], which is required in [[Lithuanian language|Lithuanian]], is represented by the character sequence {{tt|U+012F}}; {{tt|U+0307}}; {{tt|U+0301}}. Unicode maintains a list of uniquely named character sequences for abstract characters that are not directly encoded in Unicode.<ref>{{Cite web |title=Unicode Named Sequences |url=https://unicode.org/Public/UNIDATA/NamedSequences.txt |access-date=16 September 2022}}</ref>

All assigned characters have a unique and immutable name by which they are identified. This immutability has been guaranteed since version 2.0 of ''The Unicode Standard'' by its Name Stability policy.<ref name="stability-policy" /> In cases where a name is seriously defective and misleading, or has a serious typographical error, a formal '''alias''' may be defined that applications are encouraged to use in place of the official character name. For example, {{unichar|A015|YI SYLLABLE WU}} has the formal alias {{sc2|YI SYLLABLE ITERATION MARK}}, and {{unichar|FE18|PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRA'''KC'''ET|note=[[sic]]}} has the formal alias {{sc2|PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRA'''CK'''ET}}.<ref>{{Cite web |title=Unicode Name Aliases |url=https://unicode.org/Public/UNIDATA/NameAliases.txt |access-date=16 March 2010}}</ref>