Kilogram-force
The deprecated unit kilogram-force (kgf) or kilopond (kp) is the force exerted by one kilogram of mass in standard Earth gravity (defined as exactly 9.806 65 m/sē). One kilogram-force is equal to exactly 9.806 65 newtons.
Since the 1960s, it has not been an official SI unit. The SI unit of force is the newton.
External link
http://www1.bipm.org/en/si/si_brochure/chapter2/2-2/2-2-2.html
ja:キログラム重