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An A-frame is a basic structure designed to bear a load in a lightweight economical manner. The simplest form of an A-frame is two similarly sized beams, arranged in a 45-degree or less angle, attached at the top. These materials are often wooden or steel beams attached at the top by rope, welding, gluing, or riveting. Because they have only two "legs", A-frames are usually set up in rows so that they can have good stability. An advertising board, or A-board, is usually a term reserved for the advertising hoardings seen at association football matches, although there are other more general forms such as billboards and posters. Advertising boards first appeared around football stadiums in the 1970s, and are now commonplace in professional football grounds and can be great for outdoor events.