Flash trading is a form of high-frequency trading (HFT) where certain traders get information about market orders fractions of a second before the general public does. This practice enables them to capitalize on this advance notice of potential trades.
Open outcry is a method of trading on a commodity exchange where traders shout out their buy or sell offers. When a trader shouts he wants to sell at a particular price and another trader shouts he wants to buy at that price, the two traders have made a contract that will be recorded.
Suspended trading refers to the temporary halt in trading of a particular security, usually in anticipation of a major news announcement or to correct imbalances in buy and sell orders.
