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.
A halo is a circle of light that is shown in pictures round the head of a holy figure such as a saint or angel. A halo is a circle of light round a person or thing, or something that looks like a circle of light. The sun had a faint halo round it. She angrily slung a scarf around her head, flattening her halo of hair.