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I have a problem with the plural of "Fax".

Fax in itself is an abbreviation of facsimilie, so cannot have a plural.

Thus the plural of FAX can only be facsimilies, and not faxes.

Actually, there is no such rule in English. Abbreviations and acronyms very often have plural forms. The plural of No. is No.’s; the plural of DWI is DWI’s, and so on. The standard plural of fax, which has become a word in its own right, is faxes. Facsimiles is the plural of facsimile. —Stephen 21:29, 31 August 2007 (UTC)