Hand on vertical arm signals quantity "one hundred." Other arm is held horizontally at shoulder level.
Quantity - One Hundred
Numerical hand signals are generally constant throughout all trading floors but slight variations are made with figures greater than 99. Price is displayed away from the body and the quantity is displayed close to the face. Generally price is displayed before quantity ("price on quantity") to buy and it's the opposite to sell ("quantity at price"). When contracts are quoted in increments of 10ths, generally the signals used will be 1-9 and rather than increments of 10s.