closingkey
nounUK /ˈkləʊzɪŋ kiː/
US /ˈkloʊzɪŋ kiː/
A closing key is a special key that locks or shuts something.
She turned the closing key to lock the treasure chest.
OTHER MEANINGS
2. The final key pressed to finish a sequence or program.
Press the closing key to end the game.
3. A key used to close a meeting or event.
The chairman used the closing key to end the ceremony.
4. The last note or chord that ends a piece of music.
The song ended on a soft closing key.