unidentifieduse
nounUK /ˌʌn.aɪˈden.tɪ.faɪd juːs/
US /ˌʌn.aɪˈden.tə.faɪd juːs/
An unidentifieduse is a use of something that nobody knows or has figured out yet.
The strange old tool in the museum was an unidentifieduse, so visitors guessed what it was for.
OTHER MEANINGS
2. A purpose for an object that has not been officially named or recorded.
The box was labeled unidentifieduse until the scientists studied it.
3. A way of using something that is still a secret or a puzzle.
The gadget's unidentifieduse made it perfect for a detective story.
4. A placeholder term for an item whose job is not yet known.
In the catalog, the odd key was listed as unidentifieduse.