WAmbient isotopy
WBagpipe theorem
WCentered tree
WCosta's minimal surface
WDendrite (mathematics)
WDendroid (topology)
WDimensions (animation)
WEhrenpreis conjecture
WHouse with two rooms
WJacob's ladder surface
WKnaster–Kuratowski fan
WLamination (topology)
WLantern relation
WLocally simply connected space
WLoop (topology)
WNatural topology
WSolid Klein bottle
WSolid torus
WSorgenfrey plane
WStone functor
WSurface map
WSurface subgroup conjecture