Parapet (pluteus): a smooth, carved or inlaid marble panel, placed vertically and used as an enclosure and or religious furnishing.

Polychrome: an adjective of Greek origin, meaning “of many colors”.

Presbytery: area within the church reserved for the clergy; it includes the apse and the space around the main altar.

Purple: type of red, originally derived from a mollusk and used to dye very fine fabrics.