at the bottom of the letter after your name. example:
Sincerely,
Your name
cc
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The letter 'm' represents 1000 in roman numerals The letters CC represent two hundred.
The letter "C" was used as "100" in Roman numeration, so 200 = CC (not to be confused with the volume "cubic centimeter" which is "cc").
2000 CC
1350 cc
100 CC.