(mathematics) A finite collection of boxes, or cells, arranged in left-justified rows, with the row lengths in non-increasing order. Listing the number of boxes in each row gives a partition λ of a non-negative integer n, the total number of boxes of the diagram.

A kind of diagram used to plot the positions of the poles and zeroes of a function in the complex plane.

(geometry) 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.

(geometry, algebra) A Coxeter-Dynkin diagram.

A diagram representing some sets by contours of closed shapes, typically circles and ellipses, and indicating the relationships between the sets.

A diagram in the field of logic. / Any non-spatial, abstract diagram. / Any schematic display of the logical relationships of project activities.

(topology) A representation in the plane of a knot, with no triple points.

Abbreviation of pressure volume diagram.

(dated) pressure volume diagram

(paleontology) A diagram showing diversity of taxa through time by the thickness of lines, often as part of a cladogram.