Channel (stria) of semicircular, segmental, or partially elliptical section, one of many set parallel (or nearly so) to each other (collectively known as fluting) as in Classical column-shafts, where they occur in all save the Tuscan Order. In the Greek Doric Order segmental flutes are separated by arrises and stopped by annulets, while those in other Orders are deeper, separated by fillets, and terminate in quarter-spherical forms. In some instances flutes may have convex mouldings or beads (cables) set within them to one-third the height of the shaft (called cabled fluting or fluting). Small horizontal flutes, as on the Asiatic base of the Ionic Order, are reeds. If ornamenting a flat band, set vertically, flutes are strigils, while flutes cut in elongated S-shapes (as on the sides of Roman sarcophagi) are collectively referred to as strigillation.