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Angle brackets and a bar denoting quantum states.
Also known as: Dirac notation, Ket vector
Dirac's notation writes a quantum state as a ket, an angled bracket closing to the right, and its conjugate as a bra opening to the left. Putting the two together gives a bracket, which is where the joke in the name comes from and also where the inner product comes from.
Denotes a quantum state as a ket and its dual as a bra, combining to give an inner product.
Contexts: Laboratory
Takes its name from splitting the word bracket, the two halves being named for the two parts of the pair.
Contexts: Laboratory
Encodes an operator between a bra and a ket as an expectation value, which is how measurements are written.
Contexts: Laboratory
A vertical bar with a pointed bracket on one side enclosing a letter or number.