offcode
nounUK /ˈɒf.kəʊd/
US /ˈɔːf.koʊd/
A secret set of letters or numbers that lets you turn something off.
He typed the offcode to stop the alarm.
OTHER MEANINGS
2. A hidden rule in a computer program that makes it stop working.
The game crashed because of a bad offcode in the update.
3. A special signal sent to a machine to make it go quiet.
The satellite received the offcode and powered down.
4. A private word used to end a secret game or challenge.
When the teacher said the offcode, the treasure hunt was over.