Definition:Function Symbol

Definition
Let $\mathcal L$ be a formal language (for example, the language of predicate logic $\mathcal L_1$).

A function symbol is a letter of $\mathcal L$ used to describe a function.

The name function symbol is a gesture to the reader to make clear what such a symbol should (intuitively) represent in the formal language $\mathcal L$.

Also see

 * Symbol
 * Predicate Symbol