What is the meaning of Caller?

The person who makes a telephone call.

A visitor.

The person who stands at the front of the hall and announces the numbers.

A function that calls another (the callee).

A whistle or similar item used to call foxes.

The person who directs dancers in certain dances, such as American line dances and square dances.

Fresh (of food, especially fish).

Cool.

Source: wiktionary.org