Faces
face
face>
<face
Sides of 3 dimensional figures
http://www.icoachmath.com/sitemap/Face.html
http://mathforum.org/library/drmath/view/55405.html
http://en.wikipedia.org/wiki/Face_(geometry)
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Math_p045.shtml
http://www.coolmath.com/reference/math-dictionary-F.html