In shorthand 2-D fighting game notation, this stands for "cross up" or "cancel". A cross up is a
move wherein the fighter launches an aerial attack that flies just over his opponent's head and clips him on the neck. Sometimes called a "neck hit". Quite effective but a little tricky to do. A cancel is a
move that a fighter launches before a previous
move is over.
M Bison can use a good cancel in the combo: Lv2 Knee Press Nightmare XX Fierce Psycho Crusher
Geese
Howard can chain a good cancel in the combo: Crossup Jumping Forward, Standing
Short x2, Standing/Crouching Fierce XX Deadly Rave (before last hit), Standing
Short, Standing Fierce, Forward Jai-i-ken.
Scary, isn't it?