system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how are radio stations named, and why do they start with a K, like KSSK and KZOO?

Assuming there is a particular naming convention for stations, but how did that come about? Why the K and 4 letters?
gpt
The 4-letters is just because we thought that would be enough.  3 is too little and 5 is way too much.  K is used west of the Mississippi, and W east.  There are historical stations that still use three letters (WGN Chicago, for example).

The actual letters K and W were agreed to in 1912 at the International Radiotelegraphic Conferences in London.  In Morse, one is dot-dash and the other is dash-dot, which makes a little more sense.