Duplicate characters in Unicode: Difference between revisions

Revision as of 23:02, 11 November 2024

Revision as of 11:51, 16 November 2024

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{{Short description|Unicode 2.0characters that have been encoded twice}}

{{More citations needed|date=March 2022}}

[[Unicode]] has a certain amount of duplication of [[character (computing)|characters]]. These are pairs of single Unicode code points that are [[canonically equivalent]]. The reason for this are compatibility issues with legacy systems.

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*{{unichar|00B5|MICRO SIGN

|nlink=Micro-}}: {{unichar|03BC|GREEK SMALL LETTER MU|nlink=Greek and Coptic}}

*{{unichar|037E|GREEK QUESTION MARK|nlink=Question_mark#Greek_question_mark}}: {{unichar|003B|SEMICOLON|nlink=Semicolon}}

*{{unichar|212A|KELVIN SIGN|nlink=Kelvin}}: {{unichar|004B|LATIN CAPITAL LETTER K}}

*{{unichar|2024|ONE DOT LEADER|nlink=Leader_(typography)}}: {{unichar|002E|FULL STOP|nlink=Full stop}}

*{{unichar|2126|ohm sign}}: {{unichar|03A9|GREEK CAPITAL LETTER OMEGA}}

*{{Unichar|2236|RATIO}}: {{Unichar|003A|COLON}}

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*{{Unichar|2137}}: {{Unichar|5d2}}

*{{Unichar|2138}}: {{Unichar|5d3}}

*{{Unichar|2254}}: {{Unichar|003A|COLON}}, {{Unichar|03d|COLON}}

*{{Unichar|2255}}: {{Unichar|03d|COLON}}, {{Unichar|003A|COLON}}

*{{Unichar|2A74}}: {{Unichar|003A|COLON}}, {{Unichar|003A|COLON}}, {{Unichar|03d|COLON}}

===Greek===

Many [[Greek alphabet|Greek letters]] are used as [[technical symbol]]s. All of the Greek letters are encoded in the Greek section of Unicode but many are encoded a second time under the name of the technical symbol they represent. The "[[micro sign]]" (U+00B5, µ) is obviously inherited from [[ISO 8859-1]], but the origin of the others is less clear.

Other Greek glyph variants encoded as separate characters include the [[lunate sigma]] Ϲ ϲ contrasting with Σ σ, final sigma ς (strictly speaking a contextual glyph variant) contrasting with σ, The [[Qoppa]] numeral symbol Ϟ ϟ contrasting with archaic Ϙ ϙ.

Greek letters assigned separate "symbol" codepoints include the [[Letterlike Symbols]] [[ϐ]], [[ϵ]], [[ϑ]], [[Pi (letter)|ϖ]], [[ϱ]], [[ϒ]], and [[ϕ]] (contrasting with β, ε, θ, π, ρ, Υ, φ); the Ohm symbol [[Ω]] (contrasting with Ω); and the [[Unicode mathematical operators and symbols|mathematical operators]] for the product [[∏]] and sum [[∑]] (contrasting with [[Pi (letter)|Π]] and [[Σ]]).