Race Book Lingo: “Trifecta”
Similar to an Exacta, a “Trifecta” is a bet where you must pick the top three horses to come in 1st, 2nd, and 3rd, in an exact order of finish. You can also place a box bet on a trifecta where the horses come in any order of the top three places and it will cost you XXX.
(Google Trifecta Box Cost for last sentence)