In domestic legal contexts, refers to judge-made law based on precedent, as opposed to statutory law.
Common law plays an important role in Anglo-American legal systems.
customary international law
In international law, refers to rules that have become binding through consistent state practice and opinio juris.
国際慣習法は、国家の一般的慣行から生じる。
Customary international law arises from the general practice of states.