A trifecta is a parimutuel bet placed on a horse race in which the bettor must predict which horses will finish first, second, and third, in the exact order.[1] Known as a trifecta in the US and Australia,[2] this is known as a tricast in the UK,[3] a tierce in Hong Kong,[4] a triactor in Canada[5] and a tiercé in France.[6] A trio, offered in Hong Kong and France, is a variation in which the order of the horses is not relevant.[4][7][8]