Editing Farad (section)

===Informal and deprecated terminology===
The picofarad (pF) is sometimes colloquially pronounced as "puff" or "pic", as in "a ten-puff capacitor".<ref>{{cite web |title=Puff |url=http://scienceworld.wolfram.com/physics/Puff.html |publisher=Wolfram Research |access-date=2009-06-09}}</ref> Similarly, "mic" (pronounced "mike") is sometimes used informally to signify microfarads.

Nonstandard abbreviations were and are often used. Farad has been abbreviated "f", "fd", and "Fd". For the prefix "micro-", when [[mu (letter)|the Greek small letter "μ"]] or the legacy micro sign "μ" is not available (as on typewriters) or inconvenient to enter, it is often substituted with the similar-appearing "u" or "U", with little risk of confusion. It was also substituted with the similar-sounding "M" or "m", which can be confusing because M officially stands for 1,000,000, and m preferably stands for 1/1000. In texts prior to 1960, and on capacitor packages until more recently, "microfarad(s)" was abbreviated "mf" or "MFD" rather than the modern "μF". A 1940 [[Radio Shack]] catalog listed every capacitor's rating in "Mfd.", from 0.000005 Mfd. (5 pF) to 50 Mfd. (50 μF).<ref>{{cite web |title=1940 Radio Shack Catalog - Page 54 - Condensers |url=http://www.radioshackcatalogs.com/html/1940/hr054.html |website=radioshackcatalogs.com |access-date=11 July 2017 |archive-url=https://web.archive.org/web/20170711160428/http://www.radioshackcatalogs.com/html/1940/hr054.html |archive-date=11 July 2017}}</ref>

"Micromicrofarad" or "micro-microfarad" is an obsolete unit found in some older texts and labels, contains a nonstandard [[metric double prefix]]. It is exactly equivalent to a picofarad (pF). It is abbreviated μμF, uuF, or (confusingly) "mmf", "MMF", or "MMFD".

Summary of obsolete or deprecated capacitance units or abbreviations: (upper/lower case variations are not shown)
* μF (microfarad) = mf, mfd, uf
* pF (picofarad) = mmf, mmfd, pfd, μμF

{{unichar|3332}} is a square version of {{lang|ja|ファラッド}} ({{Transliteration|ja|faraddo}}, the Japanese word for "farad") intended for Japanese [[vertical text]]. 
It is included in Unicode for [[CJK Compatibility|compatibility with earlier character sets]].