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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 the 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]]).
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