Knop

The thin shaft of each stick, composed of two cylinders on either side of a central knop, is engraved with a scrollwork pattern known as vermicule for its wormlike appearance.

Source: wiktionary

In the thirteenth century come the chalices of the treasuries of Troyes and Orléans, the one in the latter having been dug up with its paten. They are of very simple design, squat in outline, with a circular foot and a gadrooned knop; the same design occurs in the fourteenth century, on the chalice in the Bordeaux Treasury.

Source: wiktionary

In the three upper elements, the knop-finial-fillet, both masters use all three squares from the base plan forming widths of 1:2:√2 (another pleasing rhythm). In the gable over the window the finials have width in the ratio of √2:4:2. The elements on the pinnacle relate to those on the gable as 1:√2, 1:2 and √2:2.

Source: wiktionary

The thick places are created by winding effect yarn around the core yarn. We can distinguish the length of the knop L, its thickness D, the distance between them Q, and the nominal diameter of continuously twisted component yarns d. The sum of the distance between the knops and the length of a knop is the stitch of this kind of fancy yarn.

Source: wiktionary