twin-keycode
nounUK /twɪn ˈkiːkəʊd/
US /twɪn ˈkiːkoʊd/
A twin-keycode is a secret pair of numbers that lets two things work together.
The game asked for the twin-keycode before it would open the treasure chest.
OTHER MEANINGS
2. A code made of two matching parts that must both be entered.
She typed the twin-keycode into both boxes to start the machine.
3. A shared secret number used by two friends or devices.
The two robots talked using their own twin-keycode.
4. A set of two linked numbers that open a special door.
Only the captain knew the twin-keycode for the ship's safe.