This is sometimes called case law, judiciary law, or unwritten law.

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Common law is developed through decisions of courts and similar tribunals, which is why it is also referred to as case law or judiciary law. It is distinguished from statutory law, which is enacted by legislative bodies, and constitutional law, which is based on a formal written constitution. Tort law is a part of common law but is specifically concerned with compensating victims of civil wrongs, not defining the system of law itself.

This Is Sometimes Called Case Law, Judiciary Law, or Unwritten