noun
local rule; house rule; ground rule
A rule that applies only in a specific place, group, or situation, not a universal rule. Often used in games, sports, workplaces, or communities.
このゲームにはローカルルールがいくつかある。
This game has several local rules.
会社のローカルルールに従ってください。
Please follow the company's house rules.
Variant with interpunct; less common but seen in some contexts.
ルール is a general rule, while ローカルルール is a rule limited to a specific context.
Wasei-eigo (Japanese-made English) from 'local' + 'rule'.