1) Architectural element 
A ridge turret is a turret or small tower constructed over the ridge or apex between two or more sloping roofs of a building. It is usually built either as an architectural ornament for purely decorative purposes or else for the practical housing of a clock, a bell or an observation platform. Its function is thus different from that of a roof lant...
Found more commonly on churches without towers, located over the crossing and named for their location on the ridge of the roof.