(physics) A diagram showing a single body or system of bodies with arrows indicating all forces acting on the system.

(geology, geochronology) A type of concordia diagram, used in the context of uranium–lead dating, whose axes are the ratios ²⁰⁷Pb/²⁰⁶Pb and ²³⁸U/²⁰⁶Pb.

Alternative spelling of entity-relationship diagram

(astronomy) Abbreviation of Hertzsprung-Russell diagram.

Alternative form of free body diagram

(construction) A diagram illustrating the amounts of material that will be cut from the terrain and used to fill other areas, for example when building a railway.

(astronomy) A graphic representation of the absolute magnitude of stars against their color (or surface temperature), which shows the main sequence of stars plus the white dwarfs and red giants.

(geometry, algebra) A graph with numerically labelled edges (called branches) representing the spatial relations between a collection of mirrors (or reflecting hyperplanes).

A diagram used to describe corresponding changes in volume and pressure in a system, commonly used in thermodynamics and physiology.

A type of flow chart; a description of data and the manual and machine processing performed on the data as it moves and changes from one stage to the next. It also includes the locations where the data are placed in permanent storage (disk, tape, etc.)