the.com/unwritten
The rules nobody printed and everybody's still expected to know.
means Not put down in writing, yet often understood, agreed, or enforced anyway through custom and unspoken consensus.
from Old English: the prefix un- (not) bolted onto written, past participle of writan, to carve or scratch — once you literally scored letters into wood or bark.
Common lawOnce called the unwritten law of precedent.
Social glueUnwritten rules govern more behavior than written ones.
Blank slateA future unwritten means anything is still possible.