Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym 21C is...

21C is

  • Sheboygan Coast Guard Station / Weather Observation Station, Sheboygan, Wisconsin USA

21C is also in:

Acronym Definition Searched: CHM TE 60973 GEP CEPT 76380 DAM RC TQR&R TMU .CC RPR IP 33119 DER