Peripheral ordinary. A straight-line variant of the gore.
Appears on dexter side unless blazoned a “gusset sinister;” frequently both are included, and blazoned “two gussets.”
Use of a charged gusset, or of a gusset with any other charges on the field, would be considered a step from period practice (SFPP).
Having gussets both charged and with charges on the field would be unregisterable.