The term 'Cathedral Niche' refers to an architectural feature found in many cathedrals and churches. It is a recess or niche in the wall of the building, usually located at the east end of the church, which is often used to house a statue or other artwork. The term 'APSE' is a four-letter word that is used to refer to this feature. An APSE is typically semicircular in shape and is often decorated with intricate designs.