A moving star with a tail, called a beard.
Default alignment: palewise, tail to base. No proper coloration.
The estoile may have a a different tincture than its beard but this would be considered a Step From Period Practice (SFPP).
Comet (1) §
Comet (2) §
Comet (4) §
This variety, with a straight tail, is found in Italian armory.
Source: Insignia Nobilium Patavinorum. Artist unknown. (Arms of Beneditti, folio 65r.)