Coil or COIL may refer to:
Geometry Helix, a space curve that winds around a line Spiral, a curve that winds around a central point
Science and technology Coil (chemistry), a tube used to cool and condense steam from a distillation Coil spring, used to store energy, absorb shock, or maintain a force between two surfaces Inductor or coil, a passive two-terminal electrical component Electromagnetic coil, formed when a conductor is wound around a core or form to create an inductor or electromagnet Induction coil, a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current supply Ignition coil, used in internal combustion engines to create a pulse of high voltage for a spark plug Intrauterine device or coil, a contraceptive device Chemical oxygen iodine laser, a near–infrared chemical laser Coil, a binary digit or bit in some communication protocols such as Modbus COIL, the gene that encodes the protein coilin Coiled tubing, a long metal pipe which is supplied spooled on a large reel
Music Coil (band), an English experimental band Coil (album), a 1997 album by Toad the Wet Sprocket "Coil", a song by Opeth from Watershed
Fictional entities The Coil, a fictional organization in the G.I. Joe universe Magnemite or Coil, a Pokémon character Coil, a crime lord from the web serial Worm
People with the surname Alison Coil, American astrophysicist Liam Mac Cóil, Irish novelist
Other uses Coil (hieroglyph), an Egyptian hieratic hieroglyph Coiled basketry, using grasses, rushes and pine needles Coiling (pottery), a method of creating pottery Coil (video game), a video game by Edmund McMillen and Florian Himsl Turmoil or burden, as in mortal coil Coiling, a method for storing rope or cable
See also Helix (disambiguation) Loop (disambiguation) Spiral (disambiguation)