Unicode compatibility characters: Difference between revisions

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Semantically distinct characters: Removing the Unihan bit because it seems redundant, it's uncited and it's exceedingly unlikely that mathematicians would do that on a regular basis since it just risks confusing their colleagues.
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=== 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 otherwise had characters for the common mathematical symbol π;. However, with Unicode, mathematicians are free to use letterscharacters from any known script in the World or to select a Unihan ideograph to stand in for a mathematical set or mathematical constant. To date, Unicode has only added specific semantic support for a few such mathematical constants (for example the Planck constant, U+210E, and Euler constant, U+2107, both of which Unicode considers to be compatibility characters). Therefore Unicode designates several mathematical symbols based on letters from Greek and Hebrew as compatibility characters. These include:
 
* [[Hebrew letter]] based symbols (4): alef (ℵ U+2135), bet (ℶ U+2136), gimel (ℷ U+2137) and dalet (ℸ U+2138)