Do you know what ZIP stand for?.. I have no idea too until I read it on the net. ZIP stand for Zoning Improvement Code. We normally hear ZIP codes in the United States. Other countries did adopt similar system localize to their country or taste.

ZIP codes in the United States entered use on July 1, 1963. It is an expansion to the postal zones system that was used in larger cities since 1943. Then it was modified again in 1983.

Some interesting zip codes:
22222 is Arlington, Virginia
44444 is Newton Falls, OH
55555 is Young America, MN
12345 is Schenectady, New York

In Malaysia, it is called Post Code. I think it entered use in the 80s.