Rotating image of human brain, illustrating the lateral sulcus in the brain. The term sulcus (pl. sulci) is a general descriptive term for a furrow or fissure.
Halo may refer to: 1  Halo (religious iconography), a glow or ring of light around a head or person in art. 2  Halo (series), video game franchise.
Circular halo. Among the best-known halos is the 22Â° halo, often just called halo, which appears as a large ring around the Sun or Moon with a radius of about 22Â° (roughly the width of an outstretched hand at arm's length).