ne exeat (nay EX-ee-aht) n. A writ to restrain a person from leaving the state, the country, or the jurisdiction of the court.
The literal Latin translation of this phrase is "let him not go out," and ne exeat regno ("let him not go out of the kingdom") is a writ that prevents someone from leaving the country. The U.S. Code provides for write of ne exeat by federal judges:
Writs of ne exeat may be granted by any justice of the Supreme Court, in cases where they might be granted by the Supreme Court; and by any district judge, in cases where they might be granted by the district court of which he is a judge. But no writ of ne exeat shall be granted unless a suit in equity is commenced, and satisfactory proof is made to the court or judge granting the same that the defendant designs quickly to depart from the United States.