Arrangement
In general, an arrangement of objects is simply a grouping of them. The number of ``arrangements'' of 
items is given eitherby a Combination (order is ignored) or Permutation (order is significant).
The division of Space into cells by a collection of Hyperplanes is also called an arrangement.
See also Combination, Cutting, Hyperplane, Ordering, Permutation- Elongated Pentagonal Orthobirotunda
- Elongated Pentagonal Orthocupolarotunda
- Elongated Pentagonal Pyramid
- Elongated Pentagonal Rotunda
- Elongated Pyramid
- Elongated Rotunda
- Elongated Square Cupola
- Elongated Square Dipyramid
- Elongated Square Gyrobicupola
- Elongated Square Pyramid
- Elongated Triangular Cupola
- Elongated Triangular Dipyramid
- Elongated Triangular Gyrobicupola
- Elongated Triangular Orthobicupola
- Elongated Triangular Pyramid
- Elsasser Function
- Wilson's Primality Test
- Wilson's Theorem
- Wilson's Theorem Corollary
- Wilson's Theorem (Gauss's Generalization)
- Winding Number (Contour)
- Winding Number (Map)
- Windmill
- Window Function
- Winkler Conditions