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The meaning of the Acronym 21 is...

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21

21 is

NAK ( Negative Acknowledgement)

More Meanings For 21:

NAK ( Negative Acknowledgement)
Karachi City Code

21 is also in:

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Acronym Definition Searched: 62374 FAST ACLAN ALOC NS PPT LLI OCM WVRI ROI 21 WERF BEF R WBIF

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