unchangingcode
nounUK /ʌnˈtʃeɪndʒɪŋ kəʊd/
US /ʌnˈtʃeɪndʒɪŋ koʊd/
Code that stays the same and never changes.
The old game used unchangingcode, so it always worked the same way.
OTHER MEANINGS
2. A set of rules that is never updated.
The club followed unchangingcode for over a hundred years.
3. A secret message that stays exactly the same.
They used unchangingcode to hide the treasure map.
4. Instructions in a computer that are locked and cannot be edited.
The robot's unchangingcode kept it safe from mistakes.