Several variant shapes exist, of which the most common is known as "potent" (Ger. "", "upside-down crutch vair"). In this form, the familiar "vair bell" is replaced by a T-shaped figure, known as a "potent" due to its resemblance to a crutch. Other furs sometimes encountered in continental heraldry, which are thought to be derived from vair, include "plumeté" or "plumetty" and "papelonné" or "papellony". In "plumeté", the panes are depicted as feathers; in "papelonné" they are depicted as scales, resembling those of a butterfly's wings (whence the name is derived). These can be modified with the color, arrangement, and size variants of vair, though those variants are much less common. In German heraldry there is also a fur known as "Kürsch", or "vair bellies", consisting of panes depicted hairy and brown. Here the phrase "vair bellies" may be a misnomer, as the belly of the red squirrel is always white, although its summer coat is indeed reddish brown.