Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym B64 is...

B64 is

  • Base64 MIME Encoded file archive (ASCII)

B64 is also in:

Acronym Definition Searched: 47368 FF UOP NECCO 47341 FCBU 19073 NFC LUCK 63654 DGN NP KIDS VMF SAA