A penalty in show jumping is called a fault, caused if a horse refuses to jump, knocks down a jump, or does not complete the course in the given amount of time.
Horseisle answer- fault
You need YEARS of experience on horses (5 at least). And you jump high jumps on horseback in front of judges. (I have been riding since I was 7 months old and I am now 11 and still have trouble...