编辑“︁微”︁

{{for|中古漢語的聲母|微母}}
'''微'''（micro-）是[[國際單位制詞頭]]，指10<sup>-6</sup>，即[[一百萬]]分之一，符號是[[希臘字母]] '''[[µ]]''' (mu)。<ref>{{SIbrochure9th}}</ref>它的語源是[[希臘語]] {{lang|el|μικρός}} ({{lang|la|mikrós}})。在只能用[[拉丁字母]]表達的情況下，[[國際單位制]]曾允許用字母[[u]]代替<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><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 |archivedate=2009-02-05 |archive-url=https://web.archive.org/web/20090205085211/http://isotc.iso.org/livelink/livelink/fetch/2000/2122/138351/138352/138353/4446951/1297176/1296842/4282436/ISO_2955-1983E_repr_of_SI_units_with_limited_char_sets.pdf?nodeid=4289384&vernum=0 |dead-url=no }}</ref>，比如um代替µm。在一些特定的場合，比如[[藥房]]，[[微克]]經常記作''mcg''<ref>{{cite web |title=ISMP List of Error-Prone Abbreviations, Symbols, and Dose Designations: Abbreviations for Doses/Measurement Units |date=2021-02-05 |work=Recommendations |publisher=[[Institute for Safe Medication Practices]] (ISMP) |url=https://www.ismp.org/recommendations/error-prone-abbreviations-list |access-date=2022-12-24 |url-status=live |archive-url=https://web.archive.org/web/20221224213621/https://www.ismp.org/recommendations/error-prone-abbreviations-list |archive-date=2022-12-24 |quote=Error-Prone Abbreviations, Symbols, and Dose Designations: μg […] Intended Meaning: Microgram […] Misinterpretation: Mistaken as mg […] Best Practice: Use mcg […]}}</ref>，然而這種記法並不符合標準。

許多國際單位制詞頭的中文翻译是取自英文詞頭的音，但微是取自英文詞頭的義。

{{SI词头}}

== 參見 ==
* [[國際單位制詞頭]]
* [[十進制]]

==参考文献==
{{reflist}}

{{中文數字單位}}

[[Category:国际单位制词头]]