This reference was cited in this topic.Understudy said:Ken, do you remember why the previous discussion concluded that the preferred pluralization would be without the "e" as in NSXes?
A quick Google shows that this other site states:
No mention of PBXes.Computer Dictionary said:The correct method is just to add the letter 's' to the acronym. Here are some examples:
PBXs (not PBX's)
VLANs (not VLAN's)
NICs (not NIC's)
PCs (not PC's)
The late Dr. Grammar states:
The standards used at NASA disagree and prefer the apostrophe, although they also note that it is not universally preferred:Dr. Grammar said:Plurals of words, acronyms, and initialisms not normally pluralized?
Form the plural of an acronym or initialism by adding an s. Do not use an apostrophe.
EXAMPLES: "MIRVs," "CRTs." To form the plural of words that do not have true plural forms, just add s.
As you can see, the apostrophe is generally omitted or avoided by most authoritative sources (the CMS is well regarded) although not universally so. And there is no mention of the use of the letter "e" with anything other than actual words.NASA said:We prefer to follow the GPO and to use the 's to form the plural of symbols, abbreviations, acronyms, designations, signs, numbers, and years:
x's
C-130's
PMT's
M.A.'s
4's
+'s
1970's
60's
Note: Chicago Manual of Style and WIT recommend that the apostrophe be used in such plural constructions only when necessary to avoid confusion.
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