High Quality Content by WIKIPEDIA articles! A triforium is a shallow gallery of arches within the thickness of inner wall, which stands above the nave in a church or cathedral. It may occur at the level of the clerestory windows, or it may be located as a separate level below the clerestory. It may itself have an outer wall of glass rather than stone. This architectural feature should not be confused with the tribune. The origin of the term is unknown but probably derived from thoroughfarum, as it was used as a passage from one end of the building to the other. The derivation from Latin tres, three, and foris, door, entrance, might also be possible as at this passage the thoroughfares and doors were in triangle shape as can be imagined from the triangular shape of this area. The triangle shape comes from the sloping roof, as can be seen in the picture on the right between the two arrows.

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