Quick answer: “Three of a Kind (Trips/Set)” means A poker hand containing three cards of the same rank plus two unmatched cards. A 'set' uses two hole cards; 'trips' uses one hole card.
Hand Rankings
Three of a Kind (Trips/Set)
A poker hand containing three cards of the same rank plus two unmatched cards. A 'set' uses two hole cards; 'trips' uses one hole card.