(Britain) A form of civil protection (using closed-circuit television, control zones and restricted access) that effectively seals off city centres and financial districts; used in Northern Ireland and the City.

Alternative form of ringfence.

A circular arena in a circus, where the acts are performed.

a ring-shaped extension on the top of a can or tin, which one pulls to open it.

a network topology consisting of a physical star and a logical ring.

(computing) A network topology in which, in the physical case, every node of a network is connected to exactly two other nodes: one node designated as upstream and the other as downstream. A given node receives data from its upstream node and sends data to its downstream node.

(computing) A network standard invented by IBM and later defined by the 802.5 subcommittee of the IEEE which provides for a network with a star ring topology, and which operates by passing a token frame around the logical ring.

(astronomy) The combined system or structure formed by all of the rings orbiting a planet

(bullfighting) The area in which bullfighting takes place.

(telephony) The ringing pattern heard by the dialer before the called party picks up the call.