The Twin-Q was a special bet at the racebooks at Circus casinos. The "Q" stands for quinella where you had to pick the first 2 horses to cross the finish line in a particular race. The "Twin" part comes in where you must pick the order in TWO different races. Sort of a extra twist on a daily double. When you bought a racing form at one of these casinos, they gave you these chips to make the bet FREE! It was in the good old days when the racebooks actually "BOOKED" bets and there were all sorts of prop bets you could play....parleys, round-robin parleys, etc. Now they're just another simulcast location.