Habeas corpus is a legal term derived from Latin, meaning "you shall have the body." It is a court order that requires a person who is holding someone in custody to bring the detainee to court. The purpose of this order is to determine whether the detention is lawful. It is a fundamental safeguard against unlawful imprisonment.

A  referendum is a general vote by the electorate on a single political question. A summons is a legal document that requires someone to appear in court, but it is not specifically a detainee. An injunction is a court order requiring a person to do or refrain from doing something. A prerogative is a special right or privilege.