Legal precedent
Precedent that is not mandatory but which is useful or relevant is known as persuasive precedent (or persuasive authority or advisory precedent). Persuasive precedent includes cases decided by lower courts, by peer or higher courts from other geographic jurisdictions, cases made in other parallel systems (for example, military courts, administrative courts, indigenous/tribal courts, State courts versus Federal courts in the United States), and in some exceptional circumstances, cases of other nations, treaties, world judicial bodies, etc.