(number theory) The finite value, denoted by B₂, to which the sum of the reciprocals of the twin primes converge, according to Brun's theorem.

A variant of hemoglobin in which a mutation in the alpha globin gene produces an alpha globin chain that is abnormally long.

(chemistry) A measure of the relative concentrations of the reactants and products of a reversible reaction at equilibrium

(mathematics) Any of a certain series of numbers that occur in the Laurent series expansion of the Riemann zeta function.

Alternative form of Dirac constant.

Alternative form of Planck's constant

(logic) A word or phrase which has an invariant logical meaning and which is useful for forming argument forms.

Describing a universal joint that allows constant power to be transmitted through a variable angle

(physics) The physical constant relating energy at the particle level with temperature observed at the bulk level. It is the gas constant R divided by the Avogadro's number N_A:- k=R/(N_rm A),

(mathematics) A constant that maintains the same value wherever it occurs; such as π. / Used other than figuratively or idiomatically: see absolute, constant.