The Diamond Club is a term used to refer to the exclusive group of Major League Baseball players who have hit 400 or more home runs in their career. The two crossword solutions for this term are BAT (3 letters) and MINNESOTAGEMINI (15 letters). BAT is an abbreviation for baseball BAT, which is the tool used by a batter to hit a baseball. MINNESOTAGEMINI is a reference to the Minnesota Twins, a professional baseball team based in Minneapolis, Minnesota.