Note: These odds are for hitting a set or trips exactly, not a set or trips at least. Odds of hitting a set on the flop = 8.3 to 1 (10.78%).Odds of hitting a trips on the flop = 73.2 to 1 (1.35%).
Odds of hitting trips and sets on the flop. So basically, a set is when you make 3-of-a-kind when you're holding a pocket pair. Sets and trips are the two separate ways of making three of a kind in Texas Hold'em.