Bill Wambsganss executed an unassisted triple play in the 1920 World Series. The rarest type of triple play, and one of the rarest events of any kind in baseball, is for a single fielder to complete all three outs in one play.

Baseball, as it was before the rise to dominance of its altered New York variant in the 1850s and 60s, was known variously as base ball, town ball, round ball, round town, goal ball, field-base, three-corner cat, the New England game, or Massachusetts baseball.

A walk (or base on balls) occurs when a pitcher throws four pitches out of the strike zone, none of which are swung at by the hitter. After refraining from swinging at four pitches out of the zone, the batter is awarded first base. In the scorebook, a walk is denoted by the letters BB.