What is a kind of bridle bit, having a joint in the part to be placed in the mouth, and rings and cheek pieces at the ends, but having no curb; -- called also snaffle bit called?

snaffle — A kind of bridle bit, having a joint in the part to be placed in the mouth, and rings and cheek pieces at the ends, but having no curb; -- called also snaffle bit. (Webster's 1913.)