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C  Code Point 

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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 displayed using a “doublestruck” typeface.
The set of complex numbers is represented by the Latin capital letter C. The symbol is often presented with a doublestruck font face just as with other number sets. The set of complex numbers extends the real numbers.
The latin small letter c is used in math to represent a variable or coefficient.
A variable is a core concept in algebra where a symbol, usualy a lower case latin letter, is used as a placeholder in a math expression.
The circumference of a circle is given the constant τ (tau) multpilied by the radius of the circle, where τ = 2π.
The set of complex numbers contains all possible complex numbers. Each complex number has a real part and an complex part.