system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do American radio stations have such weird names, namely just strange combinations of letters like WBEZ or CFRM or K-PAX or KGB?

Just asking. Tried googling a bit as well but couldn't find any satisfying answers.
gpt
The letters are the call sign.  It's just the identifier for a particular radio station.  There are *almost* always four letters.  WXKP 107.1 in New York.  KROQ 106.7 in Los Angeles.

The FCC regulates radio stations in the US so the stations have to give out their call sign to identify themselves on air.

East of the Mississippi river the stations begin with W.  West of the Mississippi the stations begin with K except for rare exceptions.