Platonism
Platonism is a philosophy of mathematics which holds that
mathematical concepts are real
Platonism is one of the three philosophies which dominate modern mathematics, the others being Intuitionism and Formalism/Logicism. However, few if any mathematicians adhere consistently to any of those three philosophies.
Platonism dates back to Plato and Socrates. The term "Platonism" is also sometimes used to refer to the philosophy of Plato generally.