Sometimes, there is an absolute limit on the number of terms an officeholder can serve, while, in other cases, the restrictions are merely on the number of consecutive terms.
For example, Maxwell's Equations would always be capitalized, while quantum mechanics is usually un-capitalized. I searched half a dozen sites for an answer to this but found no clue about a rule. So go either way that makes you happy, but (most of all) be consistent.
A relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons. Classified under: Nouns denoting cognitive processes and contents. Synonyms: QED; quantum electrodynamics. Hypernyms (QED is a kind of...): quantum field theory (the branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states).