LIFFE
Technique
Thumb and pinky fingers extended vertical with index, middle and ring fingers tucked into palm.
Origin
Fingers represent W for first letter of firms last name.
Brokerage - Dean Witter
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The ability to recognize all market participants was what made open outcry trading transparent and from this, signals were developed for the larger brokerages and for some large local traders. In cases where a more universal signal was never developed, their hand signal in the pit would simply be their three digit firm number