(geology, geochronology) A type of concordia diagram, used in the context of uranium–lead dating, whose axes are the ratios ²⁰⁶Pb/²³⁸U and ²³⁷Pb/²³⁵Pb.

Synonym of radar chart

Abbreviation of pressure volume diagram.

(astronomy) Abbreviation of Hertzsprung-Russell diagram.

(astronomy) A diagram, used to illustrate the Hubble law, in which the velocity of an object (assumed to be approximately proportional to its redshift) is plotted with respect to its distance from the observer.

A diagram representing a flow or set of dynamic relationships in a system. / A flow chart.

A nomogram.

(physics) A pictorial representation of the interactions of subatomic particles, showing their paths in space and time as lines, and their interactions as points where lines meet.

(physics, chemistry) A graph, with axes representing temperature and pressure, showing the equilibrium conditions for a given substance to be a solid, liquid or gas.

(set theory) A diagram representing some sets by contours of closed shapes, such as circles or ellipses (and sometimes also the universal set as a rectangle enclosing all of these shapes), and indicating the relationships between the sets: by overlapping the shapes to show that the corresponding sets have a non-empty intersection, and by possibly (but not necessarily) enclosing all of the sets (which are proper subsets of the universal set) within a universal set (represented typically by a rectangle); such that the total number of simply connected regions is 2ⁿ, where n is the number of depicted sets which are proper subsets of the universal set.