Acronyms, Abbreviations, and Initialisms.
All human edited and we add more daily

The meaning of the Acronym 21 is...

21 is

  • NAK ( Negative Acknowledgement)

More Meanings For 21:

  • NAK ( Negative Acknowledgement)
  • Karachi City Code

21 is also in:

Acronym Definition Searched: PT DTRT SCA CWMA WIT NABA ALR TMBP 92004 DGEBA MAOI AMNA 96717 56434 RMH