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Tetragram or tetragraph generally refers to any a group of four letters, but more specifically may refer to:

  • Tetragraph, in orthography, referring to a sequence of four letters that represent sounds not necessarily corresponding to those of the individual letters
  • Tetragrammaton, a Hebrew name for God written as YHWH
  • Complete quadrilateral, a geometric system of four lines and their six points of intersection
  • Tetragraph (from Chinese 方塊字; fāngkuàizì), referring to Chinese characters written on squared graph paper
  • A symbol with four lines in Taixuanjing
  • A degenerate star polygon, usually represented as a compound of two digons

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