keylabel
nounUK /ˈkiːˌleɪbəl/
US /ˈkiːˌleɪbəl/
A keylabel is a small tag that tells you what a key is for.
She put a keylabel on her house key so she would not mix it up with the car key.
OTHER MEANINGS
2. A short name or title printed on a key on a keyboard or keypad.
The keylabel on the button was worn off, so he could not tell what it did.
3. A code or word used to mark and sort keys in a computer system.
Each encryption key needs a clear keylabel so the right one can be found quickly.
4. A label attached to a key in a map or chart to explain its symbol.
The map's keylabel showed that a red dot means a hospital.