In reply to Steve Long:
I always assumed the difference was in how the jamming action is generated: Knee bar -> sideways rotation at the hip, Knee lock -> lateral expansion due to bending of the knee. I love offwidth climbing, and am always amused when people think it is only grunting and pain (there is that too) and no technique.
No idea what an invert torpedo (or a standard torpedo at that) is supposed to be. Full body jamming, head up or down?
CB