Tetragram
Look up tetragram in Wiktionary, the free dictionary.
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