Speakur

Word Pronunciation & Dictionary

bra-ket

Word Rarity Rare

Frequency: Zipf frequency 2.53 in modern English

Syllables
bra-ket
IPA
12
Scrabble Score
6
Letters
2
Syllables
6
Unique Chars

Meaning

noun

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).

Etymology

Concatenation of the terms bra and ket, which were introduced in 1939 and in turn derive from the splitting of the English word bracket.

Inflected Forms

bra-kets (plural)

Questions

What does bra-ket mean?
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).
Where does bra-ket come from?
Concatenation of the terms bra and ket, which were introduced in 1939 and in turn derive from the splitting of the English word bracket.

How to pronounce bra-ket

  1. Open the pronunciation page — Open the Speakur entry for “bra-ket”.
  2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
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  4. Repeat and practice — Say “bra-ket” aloud, matching stress and vowels until it feels natural.