What do the call letters of your local TV and radio station signify?

In the Chicago market are several long time TV and radio stations such as WLS, WGN. WLS stands for World’s Largest Store which I think was Marhall Fields. WGN also had a namesake, but I do not recall. Stations east of the Mississippi have “W” as lead letter, as those west of river at “K” stations. What are some in your market. I don’t mean “slang” names like “Smooth 89 Classics etc, rather the exact call letters represent something.