(quantum information science) One of a set of four entangled states, namely |𝛷⁺⟩=1/√(|00⟩+|11⟩), |𝛷⁻⟩=1/√(|00⟩-|11⟩), |𝛹⁺⟩=1/√(|01⟩+|10⟩), and |𝛹⁻⟩=1/√(|01⟩-|10⟩), where |xy⟩:=|x⟩⊗|y⟩; these are the simplest examples of entangled states.

plural of bell crank

A bell sounded at regular intervals of one minute, as a sign of mourning.

A village in Worcestershire, England (OS grid ref SO938773).

A species of honeyeater, Manorina melanophrys, endemic to southeastern Australia.

A bell rung periodically to remind a practitioner of meditation etc. to be aware of the present moment.

A church bell.

(combinatorics) Any member of a sequence of numbers that count the possible partitions of a set, such that the nth number Bₙ is the number of different ways to partition a set that has exactly n elements.

plural of Bell number

plural of Bell polynomial