1) Geometric shape
Found on
https://www.crosswordclues.com/clue/sphericon
The sphericon is a three-dimensional solid with one side and two edges. It was first introduced by the Israeli game and toy inventor David Haran Hirsch who patented it in Israel in 1980. It was given its name by Colin Roberts, of Hertfordshire, England, who also explored it. It may be constructed from a bicone (a double cone) with an apex of 90 de...
Found on
http://en.wikipedia.org/wiki/Sphericon
Sphericon. Credit: Steve Mathias A curious and mathematically delightful three-dimensional object made from a right double-cone – two identical, 90-degree cones joined base to base – and an added twist. To create a sphericon, a right double-cone is sliced along a plane that includes ...
Found on
http://www.daviddarling.info/encyclopedia/S/sphericon.html
No exact match found.
