The term 'Single and Double' refers to the two types of hits in baseball. A single is when a batter hits the ball and reaches first base safely, while a double is when a batter hits the ball and reaches second base safely. The crossword solution for this term is 'HITS', which is an acronym for 'Home Runs, Infield Hits, Triples, and Singles'. This acronym is used to refer to all four types of hits in baseball.