- See Saint Elmo's fire, under saint.
- In astronomy, the constellation of this Twins, or Gemini, and also the zodiacal sign called from that constellation, even though latter has moved entirely out from the previous.
- a historical traditional name for the corposant, or St. Elmo's fire.
- [lowercase] The name given to two minerals discovered collectively in granite in area of Elba. Look at split names.