red box
noun1
A phreaking device that generates tones to simulate the insertion of coins into a payphone, thus enabling the user to make illegitimate free calls.
2
Government, Politics UK A secure briefcase-like box used by ministers in the British government to carry their documents.
- Downing Street has rejected suggestions that David Cameron might have caused a security breach by briefly leaving his official ministerial red box unaccompanied on the table of a train carriage.2013 September 9, Ben Quinn, “No 10 denies David Cameron red box security breach”, in The Guardian:
3
Government, Military, Politics, War US A safe located at a nuclear installation containing launch codes.
4
Climatology, Meteorology, Natural sciences US, Informal A "tornado watch" notification, indicating that conditions might lead to a tornado though none has yet been sighted.
- See also: severe thunderstorm watch