An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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bracket
  براکت  
brâket
Fr.: bracket  

In Dirac’s notation, an expression which is a → scalar product of the dual vectors → bra and → ket which describe a quantum state. The bra vector appears on the left of the ket vector.

See also: From M.Fr. braguette “codpiece armor.”