CBOT
Technique
Hand moves directly over head; front of the scalp to back of the head. Click on "How-to" button above for illustration.
Origin
First three letters of this person's last name; Baldwin.
Trader BAL
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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