3B

3b, often written as 3B or 3b, is a designation used in a variety of domains to denote a third item in a series, a variant, or a specific role. The exact meaning depends on the field.

In baseball, 3B is the common abbreviation for the third baseman, the defensive player stationed near the third base. The third baseman handles grounders, bunts, and relay plays with the infield, and participates in tag plays at the base and in coordination with the shortstop on double plays. In box scores and lineups, the position is listed as 3B. The role and expectations for a 3B can vary with team strategy and league level.

Beyond sports, 3B appears as a code or label in product lines, catalogs, and documentation. It may indicate a specific variant, model, or version, often alongside other markers such as 1B, 2B, 3A, or 4C. In some contexts, 3B is used to categorize items by tier, test level, or section designation within documents or educational materials. Because there is no universal standard for the use of 3B, its interpretation is entirely context-dependent.

In summary, 3b most commonly signals a third position or variant, with baseball as the clearest and most standardized usage. Other uses are diverse and rely on the conventions of the issuing organization or field.