CBOT
Technique
One hand flat perpendicular to body and other hand with index finger extended turning into other palm.
Origin
Full name of firm is Merrill Lynch, Pierce, Fenner & Smith, Inc. and finger is meant to pierce other hand.
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