Anything circular, or almost circular, such as a round (i.e. semicircular) arch, round-arched style (Rundbogenstil), round (as opposed to prismatic) billet, round church (i.e. circular on plan), round moulding (e.g. torus), round pediment (i.e. segmental or semicircular), round ridge (i.e. with a half-cylindrical crest or ridge-tile), round tower (as in Irish round towers with conical caps and certain other bell-towers in England and Italy), and round window (as in a Catherine-wheel or rose-window).