You searched for: “anacronym
anacronym (s) (noun), anacronyms (pl)
1. A word formed from the first letters of a group of words, the original meaning of which most people don't know what the letters stand for; such as, laser and radar: The computer term URL (Uniform Resource Locator) is used on the internet as a website address, which has become an anacronym because very few people know what the letters stand for.
2. Etymology: said to be a combination of parts of the words anachronistic and acronym.