Coil

A thread of glass applied to a glass vessel, as a handle, base ring or decoration.  Horizontal decorative coils include the neck coil, rim coil, spiral trail, nicked coil, crinkly coil, and wavy coil.  Vertical decorative coils include the pincered coil and looped trail.  Decorative pattern coils include the blue zigzag, spectacle, and freestanding zigzag.  The tightly wound spiral trail or coil was the most enduring motif used in eastern Mediterranean glassworking; Islamic examples are known from as late as the 12th century A.D.