The term 'Three Quarks' refers to a model of particle physics proposed by Murray Gell-Mann in 1964. The model suggests that all matter is composed of three fundamental particles called quarks, which are held together by the strong nuclear force. The quarks are named up, down, and strange. The term 'Three Quarks' is also used to refer to the combination of these three quarks, which form the building blocks of protons. A proton is a subatomic particle composed of two up quarks and one down quark.