noun
black chamber
Refers to a secret government code-breaking or intelligence unit, historically associated with cryptanalysis. The term is a direct loan from English and is used in historical or espionage contexts.
ブラックチェンバーは、第一次世界大戦中に活躍した暗号解読機関だ。
The Black Chamber was a code-breaking agency active during World War I.
Variant with interpunct; less common but still encountered.
Loanword from English 'black chamber', referring to a secret intelligence or cryptanalysis unit.