- A line on a map joining points of equal gravitational potential (approximately coinciding with a contour line).
- (medicine) Abbreviation of isogravity (equal seriousness).
- (physics) Abbreviation of isogravity theory, combining gravity with other fundamental forces.
- (sciences) Abbreviation of iso(specific)gravity (equal density).
From Ancient Greek ἴσος (isos, “equal”) + gravity