What does DNQ stand for?

DNQ means Did Not Qualify. This usually specifically refers to the Bonus Point (BP) allocation which is only awarded to players joining a pool before the start of the relevant match. If Bru X joins a pool after the start of a match (or later in the tournament) he'll have DNQ shown in the BP column for the pool's match result. This means that Bru X does not earn any BP for the match and if he had the closest pick in the pool for that match, the BP will be allocated to the player with the next best pick in the pool - that's Bru Y who had the closest pick in the pool at the start of the match.