A type of ray system in which many short, filamentary streaks form a complex network of bright matter surrounding the lunar crater. Also known as nimbus.

An undesirable bright or dark ring surronding an image on the fluorescent screen of a television cathode-ray tube; generally due to overloading or maladjustment of the camera tube.

A ring or crescent surrounding an area of opposite sign; it is a diffusion of a high concentration of the sought mineral into surrounding ground or rock; it is encountered in mineral prospecting and in magnetic and geochemical surveys.

Any one of a large class of atmospheric optical phenomena which appear as colored or whitish rings and arcs about the sun or moon when seen through an ice crystal cloud or in a sky filled with falling ice crystals.

A ring around the photographic image of a bright source caused by light scattering in any one of a number of possible ways.