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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: 23341 BMA QTE BETA UFR TOPS WNB ROD OLEP XFJ-2 MGT JTESS AIAA 18101 NC