# Latin Capital Letter C

C
Symbol Format Data
C Code Point
U+0043
TeX
C
SVG

## Usage

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 “double-struck” typeface.

## Related

The set of complex numbers is represented by the Latin capital letter C. The symbol is often presented with a double-struck 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.