Lower case c is speed of light, capital C is for specific heat in thermodynamics.
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C = speed of light
Energy = mass x speed of light(squared)
Energy=Mass xC2 What does the C stand for?
E=MC^2 the two means that the C at the end of the formula is squared, the 2 is an exponent (meaning that you times C by itself)
C is the speed of light.