Which type of snaffle is known for having a double joint?

The French link snaffle features a double joint, which distinguishes it from other snaffle types. The design of the French link includes two pieces of metal connected in the center by a small link, creating a more forgiving feel in the horse's mouth. This configuration allows for better communication between the rider and the horse while reducing the potential for pinching the horse's tongue or palate, which can occur with single-jointed snaffles.

The unique action of the French link provides a balanced and subtle pressure that can be particularly beneficial for horses that are more sensitive to bits. Its design can help some horses respond better to the subtle cues from the rider, making it a popular choice among various disciplines.

Other types of snaffles listed have different configurations and purposes that do not employ a double joint, making them less suitable for the specific function referenced in the question.