Pedantic note: The symbol for the speed of light constant is c (italic lowercase c). https://en.wikipedia.org/wiki/Speed_of_light https://en.wikipedia.org/wiki/

Pedantic note: The symbol for the speed of light constant is c (italic lowercase c). https://en.wikipedia.org/wiki/Speed_of_light https://en.wikipedia.org/wiki/Speed_of_light Roman lowercase c is the metric prefix centi-. Roman uppercase C is the metric unit coulomb. Italic uppercase C has various uses such as: a variable denoting capacitance in electrical engineering; an undetermined constant of integration in calculus.