Direction Profit Factor
profit factor of available energy
Profit appropriation-return investment by profit
acentric factor and configuration factor
amplification factor [= magnification factor]
factor of safety [= safety factor]
factor VIII [=antihemophilia factor
factor X [=Stuart factor
factor XII [=Hageman factor
form factor [= wave form factor]
frequency factor preexponential factor
frequency factor：preexponential factor
intrinsic factor and extrinsic factor
measured factor and proportional factor
Nuclear factor (erythroid-2 related) factor 2
Nuclear factor erythroid 2-related factor 2
O factor oscillation factor