Bravo Zulu
Bravo Zulu (BZ), the combination of the Bravo and Zulu nautical signal flags, is a naval signal, typically conveyed by flaghoist or voice radio, meaning "well done" with regard to actions, operations or performance. In addition to its use in the Royal Navy, it has also been used as vernacular slang within the U.S. Navy, NATO, and other Allied naval forces.