rest energy

noun Physics.
the energy equivalent to the mass of a particle at rest in an inertial frame of reference, equal to the rest mass times the square of the speed of light.

Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Science Dictionary
rest energy   (rěst)  Pronunciation Key 
In Special Relativity, the energy corresponding to the rest mass of a body, equal to the rest mass multiplied by the speed of light squared. See more at mass-energy equivalence.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The upper limit on the rest energy of a photon is rather low.
If you are colliding electrons and positrons, then yes, all of your equations involve total energy and rest energy of the matter.
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