Enneagonal prism
TypeUniform polyhedron
Faces2 Enneagons
9 squares
Edges27
Vertices18
Vertex configuration9.4.4
Wythoff symbol2 9 | 2
Coxeter diagram
Symmetry groupD9h, [9,2], (*922), order 36
Rotation groupD9, [9,2]+, (922), order 18
Dual polyhedronEnneagonal dipyramid
Propertiesconvex semiregular
Vertex figure

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.

Family of uniform n-gonal prisms
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. 2.4.43.4.44.4.45.4.46.4.47.4.48.4.49.4.410.4.411.4.412.4.4...∞.4.4
Coxeter diagram ...


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