unwritten law

An accepted although informal rule of behavior, as in It's an unwritten law that you lock the gate when you leave the swimming pool. [Mid-1400s]

Name	Pronounced	Usage
Sandy	['sændi]
Ocean	O-shən	English (Rare)
Danijela	-	Slovene, Croatian, Serbian
Haruka	hah-ṙoo-kah	Japanese
Tor	TOOR (Swedish, Norwegian), TOR (Danish)	Swedish, Norwegian, Danish
Blaze	BLAYZ	English (Modern)