Schlegel diagram

Etymology
From +, after German mathematician , who introduced the diagram in 1886.

Noun

 * 1)  A projection of a polytope from n-dimensional space to n-1 dimensions through a point beyond one of its faces; especially such a projection (itself represented in 2 dimensions) of a 3- or 4-dimensional polytope.

Translations

 * Catalan: diagrama de Schlegel
 * French: diagramme de Schlegel
 * German: Schlegeldiagramm
 * Italian: diagramma di Schlegel
 * Spanish: diagrama de Schlegel