Which term refers to a court order that commands or authorizes some action?

The term that refers to a court order commanding or authorizing some action is a writ. A writ is a formal written order issued by a court requesting or directing the performance of a specific act, such as a writ of habeas corpus, which commands that a person be brought before the court to ensure their imprisonment is lawful. Writs play a crucial role in the legal system as they provide a mechanism for enforcing rights and judicial decisions.

While a subpoena is a type of writ used specifically to summon witnesses or documents to court, it does not encompass all types of judicial orders. The term "order" may refer broadly to any decision made by a court, and "decree" typically relates to the final disposition or ruling in equity cases rather than the authoritative command aspect inherent in a writ.