MATIF
Technique
Hand held at forehead with thumb and pinky extended, rest of fingers closed.
Origin
The logo for Merrill Lynch is a bull and the signal is meant to represent bullhorns.
Brokerage - Merill 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