What does ZIP means in zip code

because archive compression is like a zip(per): you zip it up, it's closed.

Another answer, which is probably the one that has to do with zip codes:
Dictionaries say that "zip" in "zip code" is from the initial letters of "zone improvement plan." "Zip" was also already a word meaning "to cause to go fast." So "zip code" means "a zone improvement plan that causes mail to go fast."