Capital C Symbol
The capital Latin letter C is used in mathematics to represent the set of complex numbers usually with a "doublestruck" typeface. It also appears in geometric formulas as a variable representing the circumference of a circle.
Format  Display  Data 

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Unicode  C 

Usage
Circumference of Circle  Formula
The circumference of a circle is given by two multiplied by pi and the radius.
Set of Complex Numbers  Notation
The set of complex numbers is denoted using the Latin capital letter C most often presented with a doublestruck typeface.