Capital C Symbol
The capital Latin letter C is used in mathematics as a variable. For example, it appears in geometric formulas as a variable representing the circumference of a circle. It also is used to represent the set of complex numbers, although this is usually indicated with a "double-struck" typeface.
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The circumference of a circle is given by two multiplied by pi and the radius.
The set of complex numbers contains all possible complex numbers. Each complex number has a real part and an complex part.