What do the staff wearing vests mean by gesturing to each other in the stock exchange?

The gesture of futures bidding was used in the early days when there was no computer system. Because the trading place is noisy, gesture quotation is more convenient. At present, some international exchanges are still using this quotation method in order to seek a trading atmosphere. Bidding gestures can be divided into; Buying, selling, opening and closing positions (direction), contract month and quotation (quantity). 1, the buying and selling gesture is: five fingers open, palm outward means selling, inward means buying. Make a fist with the other hand, with the thumb extending downwards to indicate the open position and upward to indicate the closed position (other gestures can also be used). 2. The quoted figures are: extend the index finger to indicate "1", extend the index finger and middle finger to indicate "2", extend the index finger, middle finger and ring finger to indicate "3", extend the four fingers except thumb to indicate "4", fully extend the five fingers to indicate "5", extend the thumb to indicate "6" (thumbs up, that is, our gesture of praise), extend the thumb and. Four fingers and thumb are pinched together to indicate "9" (that is, we often say the gesture of pinching seven). Hold out your fist to indicate "10". The red vest is a trader and the yellow vest is a cashier. The number above is the number of their seats, which can correspond to which securities company they belong to.