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thumb A trilon is a triangular prism-shaped object, turning on an axle (either mechanically or manually) to show different letters or images. Trilons have been used on game shows and billboards. The squares on the original ''Concentration'' game board, first aired in 1958, may have been the first use of trilons on a game show. The game combined the card game with a rebus puzzle, which was gradually revealed as matches were made. As the show was an immediate replacement for the disgraced ''Twenty-One'', the network insisted on keeping the puzzle pieces under high security, attaching them only to the trilons as needed.〔(【引用サイトリンク】title=Concentration ... through the decades )〕 Trilons also showed the categories on the original ''Pyramid'' series, the first-season Street Smarts episodes. The letter squares on the old ''Wheel of Fortune'' letter board used trilons until 1997. The entire game board on the original ''Family Feud'' was one large trilon through 1994, as was the board used in the Hidden Pictures rounds on the syndicated version of the Nickelodeon game show ''Finders Keepers''. The second rounds (Jailtime Challenges) of every ''Where in the World Is Carmen Sandiego?'' episode featured 15 places of the location that the second round took place, represented by trilons. The ''Jeopardy!''-like game board of ''Debt'' consisted entirely of trilons.〔(【引用サイトリンク】title=Video of a Debt episode from its first season )〕 Trilons are still being used on several ''The Price Is Right'' pricing games, such as Bargain Game and One Away. Trilons are also used in live competitions on the American version of the reality television show Big Brother. Trilons were temperamental, labor-intensive, and sometimes made a lot of noise when turned. They were largely replaced by on-set television monitors, as on ''Jeopardy!'' (starting with the 1984 revival) and ''Family Feud'' (starting with the 1999 revival).〔(【引用サイトリンク】title=Concentration: How the board worked )〕 Trilons have been used in roadside billboards. Many long, thin trilons are placed side-by-side in the frame, and periodically rotate simultaneously to cycle the billboard through three separate signs. Trilons have also been used for highway variable-message signs, although many have been replaced by dot-matrix signs capable of displaying a much wider range of messages. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「trilon」の詳細全文を読む スポンサード リンク
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