(mathematics) Formally, given two partially ordered sets A and B, the order ≤ on the Cartesian product A × B such that (a,b) ≤ (a′,b′) if and only if a < a′ or (a = a′ and b ≤ b′).

(entertainment industry) An ice show.

(immunology) Alternative form of vNAR

(UK) Used in direct address to female peers of the realm, usually now excluding duchesses and, potentially, the Lords Spiritual. / (UK) Used in direct address to female bishops.