(travel industry, aviation) (Formerly, no longer in use) An IATA defined amount used to adjust Fare Construction Units in international airfare calculations.

(algebra, ring theory) A ring in which every non-zero, non-unit (i.e., proper) element can be factored into a product of prime elements (not necessarily distinct), such that such factorization is unique up to permutation of the factors and the replacing of primes by their associate primes.

(algebra, ring theory) A unique factorization ring which is also an integral domain.

(fluid mechanics) A dimensionless friction factor relating the head loss over a pipe to the lengthscale of the pipe and the fluid velocity.

plural of unique factorization domain

Alternative form of greatest common divisor

Alternative form of greatest common divisor

A canary of a breed with reddish-orange plumage.

plural of red factor canary

(colloquial, humorous) I don't care; I have no interest in that.