Editing Micro- (section)

==Symbol encoding in character sets==
The official symbol for the [[metric prefix|SI prefix]] ''micro'' is a [[mu (letter)|Greek lowercase mu]] (μ).<ref>[https://www.bipm.org/en/measurement-units/si-prefixes Prefixes of the International System of Units], [[International Bureau of Weights and Measures]] (page visited on 9 May 2016).</ref> For reasons stemming from its design, [[Unicode]] has two different character codes for the letter, with slightly different appearance in some fonts, although most fonts use the same [[glyph#Typography|glyph]]. {{unichar|00B5|MICRO SIGN}} ({{keypress|Alt|0181}}) is in the "Latin-1 Supplement" range identical to [[ISO/IEC 8859-1]] (since 1987),<ref>(Unicode 1.0, 1991)</ref> residing at this code point also in [[DEC MCS]] (since 1983) and [[ECMA-94]] (since 1985). {{unichar|03BC|GREEK SMALL LETTER MU}} ({{keypress|Alt|956}}) is in the Greek range. According to [[The Unicode Consortium]], the Greek letter character is preferred,<ref>[https://www.unicode.org/reports/tr25 Unicode Technical Report #25]</ref> but implementations must recognize the micro sign as well, for [[Unicode compatibility characters|compatibility with legacy character sets]]. This distinction also occurs in some legacy code pages, notably [[Windows-1253]].

In circumstances in which only the [[Latin alphabet]] is available, [[International Standards Organization|ISO]] 2955 (since 1974,<ref name="ISO_2955-1974">{{cite book |title=ISO 2955-1974: Information processing - Representations of SI and other units for use in systems with limited character sets |edition=1st |date=1974}}</ref> withdrawn 2001<ref name="ISO_2955-1983">{{cite book |url=http://isotc.iso.org/livelink/livelink/4289384/ISO_2955-1983E_repr_of_SI_units_with_limited_char_sets.pdf?func=doc.Fetch&nodeid=4289384 |title=ISO 2955-1983: lnformation processing - Representations of SI and other units for use in systems with limited character sets |date=1983-05-15 |edition=2nd |chapter=Table 2 |access-date=2016-12-14}} [http://www.bgu.ac.il/~averbukh/ISO_2955-1983E.pdf]</ref>), [[Deutsches Institut für Normung|DIN]] 66030 (since 1980<ref name="DIN_66030_1980">{{cite book |title=DIN 66030: Darstellungen von Einheitennamen in Systemen mit beschränktem Schriftzeichenvorrat |language=de |edition=1st |date=1980}}</ref><ref name="Computerwoche_1981_DIN">{{cite journal |title=Neue Normen für die Informationsverarbeitung |language=de |journal=[[Computerwoche]] |date=1981-01-09 |url=http://www.computerwoche.de/a/neue-normen-fuer-die-informationsverarbeitung,1184901 |access-date=2016-12-14 |url-status=live |archive-url=https://web.archive.org/web/20161214025700/http://www.computerwoche.de/a/neue-normen-fuer-die-informationsverarbeitung%2C1184901 |archive-date=2016-12-14}}</ref>) and [[British Standards Institution|BS]] 6430 (since 1983) allow the prefix <code>μ</code> to be substituted by the letter <code>[[u]]</code> (or even <code>[[U]]</code>, if lowercase letters are not available), as, for example, in <code>um</code> for <code>μm</code>, or <code>uF</code> for <code>μF</code>, or in the common abbreviation <code>UC</code> for [[microcontroller]] (μC).
Similarly, capacitor values according to the [[RKM code]] defined in [[International Electrotechnical Commission|IEC]] 60062 (since 1952) can be written as <code>4u7</code> (or <code>4U7</code>) instead of <code>4μ7</code> if the Greek letter <code>μ</code> is not available.

The [[CJK Compatibility]] block contains square forms of some Japanese [[katakana]] measure and currency units.
{{Unichar|3343}} corresponds to {{lang|ja|マイクロ}} {{Transliteration|ja|maikuro}}.