keepcode
nounUK /ˈkiːpkəʊd/
US /ˈkiːpkoʊd/
A secret set of letters or numbers you use to keep something safe.
I typed my keepcode to open the treasure box.
OTHER MEANINGS
2. A special code that saves your place in a game.
Write down the keepcode so you can start the game again later.
3. A rule in a club that says members must keep its codes.
The treehouse club has a keepcode everyone must follow.
4. A hidden message that stays the same when you copy it.
The spy wrote a keepcode that looked the same on every paper.