title: Enneagonal prism
text: # Enneagonal prism
  
  In geometry, the enneagonal prism (or nonagonal prism) is the seventh in an infinite set of prisms, formed by square sides and two regular enneagon caps.
  
  If faces are all regular, it is a semiregular polyhedron.
  
  ## Related polyhedra
  
  Family of uniform n-gonal prisms vte :
  
  | Prism name | Digonal prism | (Trigonal) Triangular prism | (Tetragonal) Square prism | Pentagonal prism | Hexagonal prism | Heptagonal prism | Octagonal prism | Enneagonal prism | Decagonal prism | Hendecagonal prism | Dodecagonal prism | ... | Apeirogonal prism |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | Polyhedron image | | | | | | | | | | | | ... | |
  | Spherical tiling image | | | | | | | | | | | | Plane tiling image | |
  | Vertex config. | 2.4.4 | 3.4.4 | 4.4.4 | 5.4.4 | 6.4.4 | 7.4.4 | 8.4.4 | 9.4.4 | 10.4.4 | 11.4.4 | 12.4.4 | ... | ∞.4.4 |
  | Coxeter diagram | | | | | | | | | | | | ... | |
  
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