The poundal (symbol: pdl) is a unit of force that is part of the foot–pound–second system of units, in Imperial units introduced in 1877, and is from the specialized subsystem of English absolute (a coherent system).
millinewtons
The millinewton is a multiple of the unit bit for Force. The prefix milli (symbol m) is defined in the International System of Units (SI) as a multiplier of 1 × 10-3 (1 thousandth, short scale), and therefore 1 millinewton = 1 × 10-3 newtons = 0.001 newtons. The millinewton has the unit symbol mN.