This name, which means �pipe�, is usually qualified with other terms (see variants below). By itself, according to Irwin, it indicates an open flute of 8' pitch, usually of wood but occasionally of metal. On a theatre organ, the name Tibia indicates a Tibia Clausa. While this term was in use long before Hope-Jones arrived on the scene, his use of it has effectively redefined it to indicate a family of huge scaled flutes with little harmonic development.

Echo Tibia Clausa Tibia Angusta Tibia Angusta Barbata Tibia Aperta Tibia Bifara Tibia Bifarius

Tibia Clausa Tibia Cuspida Tibia Dura Tibia Flute Tibia Major Tibia Minor

Tibia Mollis Tibia Plena Tibia Profunda Tibia Profundissima Tibia Rex Tibia Rurestris

Tibia Silvestris Tibia Transversa Tibia Traversa Tibia Vulgaris