red box English

Meaning red box meaning

What does red box mean?

red box noun

— A phreaking device that generates tones to simulate the insertion of coins into a payphone, thus enabling the user to make illegitimate free calls.

— (UK) A secure briefcase-like box used by ministers in the British government to carry their documents.

— (US, military) A safe located at a nuclear installation containing launch codes.

— (informal, US, meteorology) A "tornado watch" notification, indicating that conditions might lead to a tornado though none has yet been sighted.