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.
The word quantum comes from the Latin quantus, meaning how much. Quanta, short for quanta of electricity (electrons) was used in a 1902 article on the photoelectric effect by Philipp Lenard, who credited Hermann von Helmholtz for using the word in the area of electricity.his means that the magnitude can take on only certain discrete values. A photon is a single quantum of (visible) light as well as all other forms of electromagnetic radiation and can be referred to as a light quantum.