Call sign

A call sign is a word or a set of letters and numbers that are used to identify something. It's like a nickname for things that communicate with each other, like airplanes, ships, or even radio operators.

It's kind of like how your parents call you by your name to get your attention or how you have a pet name for your favorite toy. These call signs help people or things identify each other when they are talking or communicating.

For example, if an airplane wants to talk to air traffic control, it would say its call sign so the control tower knows which airplane it is. The call sign might be something like "Delta 123" or "American 456".

In the same way, ships use call signs to communicate with other ships or ports. And radio operators use call signs to identify themselves when they're talking on the radio.

So, think of call signs as nicknames for things that communicate with each other so they know who they're talking to!