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A signaling device, usually electrically operated, that emits an audible signal and/or a visual indication under selected circumstances; for example, it may sound an alarm in the case of fire or unauthorized entry.

A small molding, usually circular in plan and square or angular in section; esp. one of the fillets encircling the lower part of the Doric capital above the necking.

A shaft or cluster of shafts fitted, at intervals, with rings.

A barrel vault in the shape of a ring, instead of a straight line; covers a space of which the plan is formed by the area between two concentric circles, or any portion of such a space

A nail with circular ridges around its shaft; provides greater holding power than a nail without such ridges.

Any molding that is circular in plan, such as the torus at the base of a column.