Rondel dagger is a type of dagger where two discs were used instead of a guard and a pommel. The discs provided good protection for the hand and also served as stops that prevented it from slipping off when stabbing. A dagger of this type has been known since the XVI century, but it flourished in the XV - XVII centuries.
Sabre is a cutting and bladed weapon, and many types of sabres allow stabbing. The handle of the sabre is adapted for one-handed grip, and the sabre blade is on the convex side. Due to this shape of the blade, the best types of sabres do not just cut, but also cut through an obstacle that gets in the way of the blade.