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What does 21 stand for? 

What does 21 mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: 21.

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21

CB Lingo: 10-21 call by telephone

Miscellaneous » Slang

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What does 21 mean?

twenty-one, 21, XXI(adj)
the cardinal number that is the sum of twenty and one

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Maybe you were looking for one of these abbreviations:

20ste - 20TN - 20TX - 20U - 20V - 21 CFR Part 314 Subpart H - 21 MFI - 210 - 21001 - 21002

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