'e' is energy. and it is written with a capital 'E'.
Hence
E = mc^(2).
Where
'm' is the mass in 'kilograms'.
'c' is the speed of light
NB
Note how similar it is to K.E. (kinetric Energy)
K.E. = mv^(2).
Where 'v' is the veloicty of the object.
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e= energy m=mass c=speed of light
E stands for Energy, M stands for Mass, C stands for the speed of light.. So Energy = Mass times the Speed of Light squared.
w = hf - E
M = mass
E=m*c2