In Geometry, the disphénoïde softened is one of the solid of Johnson ( J ₈₄). It is a Polyèdre which has only formed faces of equilateral triangles, and is, consequently a Deltaèdre. It is not a regular Polyèdre because some tops have four faces and others have five of them. It is one of the elementary solids of Johnson who does not appear starting from handling in " to copy/coller" of solid of solid Plato and of Archimèdes.

The 92 solid of Johnson were named and described by Norman Johnson in 1966.

External bonds

• MathWorld.wolfram.com - Johnson Solid
• polyhedrons of Johnson