Editing Micrometre (section)

== Symbol ==
{{See also|Micro-#Symbol encoding in character sets}}

The official symbol for the [[metric prefix|SI prefix]] ''micro-'' is a [[mu (letter)|Greek lowercase mu]].<ref>{{Cite web|url=https://www.bipm.org/en/measurement-units/prefixes.html|title=Prefixes of the International System of Units|publisher=[[International Bureau of Weights and Measures]]|access-date=9 May 2016|archive-date=23 May 2018|archive-url=https://web.archive.org/web/20180523190122/https://www.bipm.org/en/measurement-units/prefixes.html|url-status=dead}}</ref> [[Unicode]] has inherited {{unichar|00B5|MICRO SIGN}} from [[ISO/IEC 8859-1]], distinct from the [[code point]] {{unichar|03BC|GREEK SMALL LETTER MU}}. According to the [[Unicode Consortium]], the Greek letter character is preferred,<ref>{{Cite web|url=https://unicode.org/reports/tr25/|title=Unicode Technical Report #25|last1=Beeton|first1=Barbara|last2=Freytag|first2=Asmus|date=30 May 2017|website=Unicode Technical Reports|publisher=[[Unicode Consortium]]|page=11|last3=Sargent|first3=Murray III}}</ref> but implementations must recognize the micro sign as well for [[Unicode compatibility characters|compatibility with legacy character sets]]. Most fonts use the same [[glyph#Typography|glyph]] for the two [[character (computing)|characters]].

Before [[desktop publishing]] became commonplace, it was customary to render the symbol μ in texts produced with mechanical [[typewriter]]s by combining a slightly lowered slash with the letter {{font|u|font=courier}}. For example, "15&nbsp;μm" would appear as "{{font|1=15<span style="letter-spacing:-0.25em"><sub>{{resize|130%|/}}</sub></span>um|font=courier}}". This gave rise in early [[word processing]] to substituting just the letter {{font|u|font=roman}} for the symbol if the Greek letter μ was not available, as in "{{font|15&nbsp;um|font=roman}}".<ref>{{cite book |title=The American Directory of Writer's Guidelines: A Compilation of Information for Freelancers from More Than 1,300 Magazine Editors and Book Publishers |editor=John C. Mutchler |page=47 |publisher=Quill Driver Books |year=1999 |isbn=978-1-884956-08-9 |url=https://books.google.com/books?id=94MYAAAAIAAJ&q=%22If+you+can-not+access+the+Greek+letter%22+%22use+the+Roman+lower-case+letter+u%22 |edition=2}}</ref>

The Unicode [[CJK Compatibility]] block contains square forms of some Japanese [[katakana]] measure and currency units.
{{Unichar|3348}} corresponds to {{lang|ja|ミクロン}} {{Transliteration|ja|mikuron}}.