one's own rule; personal rule
A self-imposed rule or principle one follows in daily life, often for convenience or personal satisfaction. Wasei-eigo from English 'my rule'.
wasei-eigo (Japanese-coined English), from my rule
My personal rule is to drink a glass of water first thing in the morning.
He has a personal rule not to look at his smartphone during work.
Variant with interpunct; less common but seen in some contexts.
Wasei-eigo (Japanese-made English) from 'my' + 'rule'. Not used in English with this meaning.