The Tibia Clausa is arguably the most important rank of pipes in a theatre pipe organ, with some organs having as many as 5. The stop shares similarities with the Bourdon and the Gedackt found in some church pipe organs.
The Tibia Clausa is a significant rank of pipes in a theatre pipe organ, often found in multiple organs.  It shares characteristics with the Bourdon and Gedackt pipes commonly used in church pipe organs.