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 halogen is a monovalent element on the Periodic Table, which easily forms negative ions. There are 5 such halogens - fluorine, chlorine, bromine, iodine, and astatine - but only iodine and bromine are used in lamps. In a halogen light bulb, the filament wears down, shedding tungsten atoms over time.