What is bb in baseball?

In baseball, "bb" commonly refers to a "base on balls," also known as a "walk." This occurs when a pitcher throws four pitches outside of the strike zone, and the batter does not swing at any of them. The batter is then awarded first base without having to hit the ball.

Walks are often seen as a positive outcome for a batter, as it gives them an opportunity to reach base without having to make contact with the ball. It can also be seen as a negative outcome for a pitcher, as it can lead to an increase in the number of baserunners and potentially lead to runs being scored.

BB is also sometimes used as an abbreviation for other baseball-related terms, such as "batting average" (BA), "baseball" (often abbreviated as "BB" in informal contexts), or "bullpen" (BP).