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

FXXI is

  • Force Twenty One

FXXI is also in:

Acronym Definition Searched: SIS LGPL SGS 34228 WBBZ WFBA 14810 4A9 DHD 08244 EVSN 77053 NTO LV ZSI