What term below is not identified as an individual piece of an English snaffle bridle?

An English snaffle bridle the most commonly used bridle because of its versatility and functionality. It is generally used in starting young horses, trail riding and in all the sport horse disciplines: dressage, jumper, hunter and eventing. Also, it is used in foxhunting as well. The snaffle bridle is made up of individual parts including a headstall or crownpiece, cheekpiece, noseband or cavesson, throatlatch, browband, single rein, and a snaffle bit such as an eggbutt, loose ring or D-ring.

A snaffle bridle works through pressure— pressure from the bit as it applies to the bars and corners of the horse’s mouth, lips, tongue and palate, and pressure from the bridle as it applies to the horse’s poll and nasal bone.