c
Symbol  Format  Data 

c  Code Point 

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The Latin letter is used in mathematics to represent a variable or coefficient.
The Latin capital 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. The symbol is also used to represent the set of complex numbers, although, this is usually indicated with a "doublestruck" typeface.
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.