SIMEX
Technique
Index finger extended then pointing towards ear and wiggling at wrist
Origin
"digging for gold" is a common reference to someone digging ear wax from their ear
Brokerage - Goldman Sachs version 1
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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