W3-manifold
W(−2,3,7) pretzel knot
WEhrenpreis conjecture
WFigure-eight knot (mathematics)
WHorosphere
WHyperbolic link
WI-bundle
WKleinian group
WNormal surface
WPleated surface
WPretzel link
WRicci flow
WSnapPea
WSolid Klein bottle
WSurface subgroup conjecture
WUnknotting problem
WWhitehead manifold