Common Law Writs

A body of legal remedies, sometimes called extraordinary remedies or common law writs, was a part of Anglo-English law at the time of adoption of the Constitution, and incorporated by the Constitution. Only one of these, however, habeas corpus, is explicitly mentioned in the Constitution, and the rest would seem to be included by the Ninth Amendment as among the unenumerated rights. They have been deprecated in recent decades, and there is a movement to resurrect them.

1.   Definition of writ — From the Word IQ site.
2.  Quo Warranto — Challenge to the authority of someone claiming it, to either prevent or end unauthorized action or remove him from his claimed position.