However, The Dickson Baseball Dictionary discusses the term in greater depth. The open seating area was originally called the "bleaching boards", as early as 1877. By the early 1900s, the term "bleachers" was being used for both the seating area and its inhabitants. Thus, Dickson lists the fans themselves as "bleachers", as a secondary definition. Other terms, such as "bleacher seats" and "bleacher entrance" and "a home run into the bleachers", are ambiguous enough that they could refer to either the seats or the fans. However, in modern usage the term "bleachers" almost always refers to just the seating area, and its participants may be called "bleacher fans", or "bleacherites", or (in Chicago) "bleacher bums".
In baseball stadiums, the bleachers are usually located beyond the outfield fences. However, center-field bleachers are located in the line of sight of the batter, and the presence of fans makes it difficult for the batter to pick out the ball. As a result, most stadiums have vacant areas or black backgrounds where the seats would be. This is known as either the "Backdrop" or the Batter's eye. Yankee Stadium has featured black-painted vacant bleachers -- nicknamed the black by baseball fans -- since it reopened in 1976 after a two-year renovation. In the original Stadium, the center-field section of the bleachers was originally occupied, though from the 1950s they were obscured with a portable screen. Bleachers can be used for all sports known.
The term "under the bleachers" is imbued with cultural meaning from the post-war era of American high school American football stars and cheerleaders. In the sexually conservative society of post-war America, some students would find places like the bleachers at the American football field, or a secluded parking lot, to interact socially and sexually with their peers. The "bleachers" have been given cultural connotations of the innocence of high school and youth. The British equivalent is "behind the bike sheds".