In Edge Words (WW98274), Upward Edge Words (WW2006235) and Generic Edges (WW2007235), the letters of a word are arranged, in the order in which they occur in the word (1, 2, 3 ...), to make a range of forms - triangles, pentagons and rhombuses (see below respectively).
"Hexagons and Their Edges,"
Word Ways: Vol. 41
, Article 8.
Available at: http://digitalcommons.butler.edu/wordways/vol41/iss1/8