Unicode Compatibility Characters

Unicode Compatibility Characters

In Unicode and the UCS, a compatibility character is a character that is encoded solely to maintain round trip convertability with other, often older, standards. As the Unicode Glossary says:

A character that would not have been encoded except for compatibility and round-trip convertibility with other standards

Although compatibility is used in names, it is not marked as a property. However, the definition is more complicated than the glossary reveals. One of the properties given to characters by the Unicode consortium is the characters' decomposition or compatibility decomposition. Over five thousand characters do have a compatibility decomposition mapping that compatibility character to one or more other UCS characters. By setting a character's decomposition property, Unicode establishes that character as a compatibility character. The reasons for these compatibility designations are varied and are discussed in further detail below. The term decomposition sometimes confuses because a character's decomposition can, in some cases, be a singleton. In these cases the decomposition of one character is simply another approximately (but not canonically) equivalent character.

Read more about Unicode Compatibility Characters:  Compatibility Character Types and Keywords

Other articles related to "unicode compatibility characters, compatibility characters, characters, character":

Unicode Compatibility Characters - Compatibility Mappings Types - Semantically Distinct Characters
... Many compatibility characters are semantically distinct characters, though they may share representational glyphs with other characters ... Some of these characters may have been included because most other characters sets that focused on one script or writing system ... So for example, the ISO and other Latin character sets likely included a character for π (pi) since, when focusing on primarily one writing system or script, those character sets would not have ...

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