(computer graphics) An algorithm for generating heightmaps. It starts with a two-dimensional grid and then randomly generates terrain height from four seed values arranged in a grid of points so that the entire plane is covered in squares.

hematite / anthracite / carbonado, a natural diamond that is black in colour / A black synthetic diamond, specifically a CVD polycrystalline diamond or HPHT polycrystalline compact diamond.

(informal) A coloured diamond symbol identifying the specific risks posed by a hazardous material according to the NFPA 704 classification.

(telecommunications, chiefly attributive) A service that allows an international (or other) telephone call to be made indirectly through another number, thus avoiding the usual call routing and potentially saving money.

A mathematical problem in which a set of deliveries must be made along a set of available routes between fixed sources and destinations, within limited time periods, and with the possibility of changing vehicles during a trip.

plural of dial-a-ride problem

plural of diamondback rattlesnake

Abbreviation of pressure volume diagram.

(dated) pressure volume diagram

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