🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiРусскийالعربية한국어中文日本語EntityQ1141109· pop 16· linked from 222 articlesRoom 40Also known as 40 O.B.cryptanalysis departmentWikidata factsImageAdmiralty office Whitehall 1760 D Cunego.jpgSources (1)wikidata.orgvia Wikidata · CC0Available in 15 languagesEspañolFrançaisDeutsch中文日本語РусскийItalianoالعربيةGreekHebrewNorwegianConnectionsWorld War IConceptZimmermann telegramEntityCategories1914 establishments in the United Kingdom1919 disestablishments in the United KingdomCryptography organizationsGovernment agencies established in 1914History of cryptographyIndividual roomsLocations in the history of espionageMilitary history of the United Kingdom during World War IMilitary units and formations of the Royal Navy in World War IRoyal Navy shore establishmentsSignals intelligence of World War I