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: START EID C SWPF MSS 12827 TSS ADT EOC EAC WER ARGX REDI TMMC W2W