CBOT
Technique
Hand on vertical arm signals quantity "one hundred." Other arm is held horizontally at shoulder level.
Quantity - One Hundred

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Hand on vertical arm signals quantity "one hundred." Other arm is held horizontally at shoulder level.

Arm held overhead, one index finger pointed upward.

Hand is formed into a fist held at arm's length.

Pinky finger is extended upward from fist held at arm's length.

Thumb is extended outward from fist held at arm's length.

Hand is formed into a fist held at arm's length.

Index finger is extended horizontally.

Index and middle fingers are extended horizontally.

Middle, ring and pinky fingers are extended horizontally.

With thumb folded out of sight, four fingers are held widely spaced.

All five fingers are held widely spaced.

All five fingers are held pressed together.

Thumb is extended upward from fist.
Prices-Quantities
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.