Hi,"double fist" (for lack of a better term) up and out. It's meant to be a defense against a hammer fist. The block will either hit the arm just above or just below the elbow. According the my instuctor, its from the polynesian background of the kempo arts as opposed to the chinese influences.
Thanks for your answer - this is what I call helpful! Please don't worry about response time...I appreciate your effort. I can see what you are saying, have applied this type of block against a club attack at the wrist though, (and have had it applied to me) and I can tell it works.
"Double fist" is a fine term... call it what you will, you are indeed correct!
Please tell your instructor thanks for the explanation as well.
See ya later,
MJ