Sometimes an acronym was first created and then had to be changed in the future because the original meaning isn't valid anymore or is too restrictive. These are sometimes referred to as "anacronyms".
Here is an example:
DVD: Digital Video Disc ?
It started out as Digital Video Disc, but later on, there were other uses for these discs besides video. An interesting situation arose: what would be an appropriate word that starts with V and would convey the meaning of multi-purpose? The word "versatile" was thrown around for a bit, but never entered common usage.
However, according to the official DVD specifications, it doesn't stand for anything, it is just the letters "DVD". Now with DVDs in the mainstream, they will be thought of as always standing for digital video disc, especially with the popularity of movie rental services such as Netflix.
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