simplex in Catalan

(computing, telecommunications) Of a circuit or device: involving signals which travel in one direction at a time; unidirectional.

(algebraic, _, topology, geometry) A generalization of a triangle or tetrahedron to an arbitrary dimension, the generalization being the simplest possible convex polytope for a given dimension; more accurately, the convex hull of n+1 affinely independent points in n-dimensional space.