SIMEX
Technique
Palm upward with fingers shifting around as if rolling ball bearings around in hand. Click on "How-to" button above for illustration.
Origin
Barings sounds similar to bearings.
Barings Bank
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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