Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym 19 is...

19 is

  • DC3 (Device Control 3) (XOFF)

19 is also in:

Acronym Definition Searched: SEON VCP ERM OUU HOB PYO SMCP HLC MU-RADIL PLK TC 44I 18638 CBR FSC