Duplicate characters in Unicode: Difference between revisions

Revision as of 17:59, 28 November 2019

Revision as of 01:22, 30 June 2020

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==Letterlike symbols==

{{main|Letterlike Symbols}}

In some cases, specific graphemes have acquired a specialized symbolic or technical meaning separate from their original function. A prominent example is the Greek letter [[Pi (letter)|π]] which is widely recognized as the symbol for the mathematical constant of a circle's circumference divided by its diameter even by people not literate in Greek.

Several variants of the entire Greek and Latin alphabets specifically for use as mathematical symbols are encoded in the [[Mathematical Alphanumeric Symbols]] range. This range disambiguates characters that would usually be considered font variants but are encoded separately because of widespread use of font variants (e.g. [[L]] vs. "script L" {{SMP|Latn|ℒ}} vs. "blackletter L" {{SMP|de-Latf|𝔏}} vs. "boldface blackletter L" {{SMP|de-Latf|𝕷}}) as distinctive [[mathematical symbols]]. It is intended for use only in mathematical or technical notation, not use in non-technical text.<ref>[http://unicode.org/reports/tr25/tr25-5.html#_Toc21 Draft Unicode Technical Report #25]</ref>

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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]]).

===Roman numerals===