But I was a little surprised to see that ZIP code is trademarked! I got a post card from the post office, and noticed that "ZIP" has "TM" by it. This struck me as funny, because what business, person, etc. would would want to use "ZIP code"? LOL
Do you know what ZIP stands for, anyhow? It is an acronym for "Zone Improvement Plan."
Upon further investigation, I found the following information at Wikipedia:
ZIP Code was originally registered as a trademark by the U.S. Postal Service, but its registration has since expired.
So if it's not really trademarked, then why would they use "TM" by it??? Questions, questions! *Grin*