A mattress protector.

An item of removable bedding that sits on top of or encases a mattress to protect it from stains and sometimes to protect the sleeper from allergens and irritants.

(mathematics) A method of proof which, in terms of a predicate P, could be stated as: if P(0) is true and if for any natural number n>0, P(n) implies P(n+1), then P(n) is true for any natural number n.

(physics) In the Standard Model, a unitary matrix that specifies the mismatch of quantum states of quarks when they propagate freely and when they take part in the weak interactions. It is important in the understanding of CP violation.

(physics) Abbreviation of Cabibbo-Kobayashi-Maskawa matrix.

physical material, containing an inscribed message, used as a means of communication between intelligences separated by astronomical distances

A cinematographic cut between two different objects, spaces, or compositions in which there is a correspondence between the two scenes, helping to establish continuity of action and linking the two shots metaphorically.

grain itch

A type of organizational management in which people with similar skills are pooled for work assignments and may have more than one manager.

Alternative form of love match