Citations:triangle

Noun: baseball: the area between three fielders, especially in reference to a ball hit into that area

 * 2003, Jack Stallings, Bob Bennett, Baseball Strategies: Your Guide to the Game within the Game, page 214, ISBN 1450408303
 * For example, let's consider a short fly ball hit in the triangle near the foul line in short right field. The player with first priority to make the catch would be the right fielder, who is supposed to be highly skilled at catching fly balls and has a good angle because he is coming in on the ball.