Dynamic Threshold prices limits the posting of orders to a certain range of prices based on the last traded price of the stock. These price limits are set by the PSE and are shown in the stock's price quotation.
Based on the last price of 38.30, the PSE has set the Dynamic Threshold prices at maximum of 42.13 (Dyn T High) and minimum of 34.47 (Dyn T Low). This means that you may only post an order within this price range. Since these price limits are "dynamic", this means that the Dyn T High and Low prices would also adjust according to the upward or downward change in the last price of the stock.