The story
From Miranda v. Arizona (1966), the usual name for a U.S. Supreme Court case in which the Court held that criminal suspects must be informed of certain rights, after Ernesto Miranda.
Etymology from Wiktionary, CC BY-SA 4.0.
Miranda warning
Today it means: A warning given by a law enforcement officer to criminal suspects in his custody advising them of certain constitutional rights, called their Miranda rights. Full definition →