* Dyne: One dyne is equal to 10^-5 Newtons. It's a very small unit of force, often used in measuring the forces acting on very small objects.

* Poundal: This unit is used in the foot-pound-second (fps) system of units. One poundal is equal to approximately 0.138 Newtons.

* Kilogram-force (kgf): This unit is equal to the force exerted by gravity on a 1-kilogram mass. One kgf is approximately equal to 9.81 Newtons.

Important Note: The size of a force unit is relative. The Newton is the standard unit in the International System of Units (SI), but other units are still used in various contexts.