Noun
English Wikipedia has an article on:Bra–ket notationWikipedia
bra-ket (plural bra-kets)
(physics) The scalar product of two vectors (and optionally an operator), in Hilbert space, where the left (row) vector is a bra and the right (column) vector is a ket. Symbolised by ⟨...|...⟩ (bra and ket only) or ⟨...|...|...⟩ (bra, operator, ket).
Many phenomena that are explained using quantum mechanics are usually most clearly demonstrated with the help of the bra-ket notation. Source: Internet
Properties bra-ket notation was designed to facilitate the formal manipulation of linear-algebraic expressions. Source: Internet
Since virtually every calculation in quantum mechanics involves vectors and linear operators, it can involve, and often does involve, bra-ket notation. Source: Internet
The bra-ket notation continues to work in an analogous way in this broader context. Source: Internet
This is known as Dirac notation or bra-ket notation. Source: Internet