(set theory, of two sets A and B) The set that contains exactly those elements belonging to A but not to B; the relative complement of B in A.

(networking) a code that identifies the network to which packets on a wireless network belong

(sports) on your mark, get set, go

Alternative form of dead against.

To physically arrange a shop or workplace. / (idiomatic) To establish a business.

(set theory) A set having a specified total order.

plural of service set identifier

The general field of topology, not restricting attention to specific classes of spaces, and not using algebraic topology.

plural of set-top box

plural of key set identifier