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While these compatibility characters are distinguished from their compatibility decomposition characters only by adding the word "symbol" to their name, they do represent long-standing distinct meanings in written mathematics. However, for all practical purposes they share the same semantics as their compatibility equivalent Greek or Hebrew letter. These may be considered border-line semantically distinguishable characters so they are not included in the total.
Though not the intention of Unicode to encode such measuring units the repertoire includes six (6) such symbols that should not be used by authors: the characters' decompositions should be used instead.<ref>Omega, mu, Angstrom, Kelvin: {{cite web |url=http://www.unicode.org/reports/tr25/ |title=Unicode Technical Report #25 / Unicode Support for Mathematics |date=2017-05-30 |page=11 |author=Unicode Consortium}}</ref><ref name="decomp" />
* Unit symbols (6): [[Angstrom]] (Å U+212B: use U+00C5 instead), [[Ohm]] (Ω, U+2126: use U+03A9 instead), [[Kelvin]] (K U+212A: use U+004B instead), [[Fahrenheit]] (℉ U+2109: use [[°|U+00B0]] and U+0046 instead), [[Celsius]] (℃ U+2103: use U+00B0 and U+0043 instead), [[micro-|Micro]] Sign (µ U+00B5: use U+03BC instead)
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