CME
Technique
Pinky and index finger extended upward as thumb, ring and middle fingers are tucked into palm.
Origin
Based upon the horns of Merrill Lynch's bull logo.
Brokerage - Merrill Lynch
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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