In the field of quantum mechanics, the Hamiltonian of a system is an operator corresponding to the total energy of that system, including both kinetic energy and potential energy. When used to operate on an appropriate quantity (namely the wavefunction in the context of quantum mechanics) gives you the total energy of the system—the sum of the kinetic (written as K, or sometimes as T) and the potential (U or V) energy. It was mentioned by a young Emmett Brown during Back to the Future: The Game - 1: It's About Time.

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