Trilon

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• A trilon is a box in the shape of an equilateral-triangular right prism that is occasionally used on certain older game shows to hide information until needed. The squares on the old Concentration game board, the categories on pre-Donny Osmond Pyramid, first-season Street Smarts episodes, and the letter squares on the old Wheel of Fortune letter board used trilons. The entire game board on Family Feud was a giant trilon through 1994, as was the board used in the Hidden Pictures rounds on the syndicated version of the Nickelodeon game show Finders Keepers. Trilons are still being used on The Price is Rights pricing games, such as Barker's Bargain Bar.

More recently, 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.

• The Trilon (or Trylon) and the perisphere were the central structures of the New York World's Fair of 1939-1940. The Trylon was designed by architects Wallace Harrison and J. Andre Fouilhoux. The trilon was a 700-foot spire. Built in Flushing Meadows in Queens, New York, both structures were subsequently razed.

The Trilon is mentioned in the Groucho Marx song "Lydia the Tattooed Lady" and the Aimee Mann song "Fifty Years After the Fair".

• Trylon was a company that manufactured triangular cross section radio masts and towers, it was acquired by TSF, a radio communications company, to form Trylon TSF.