- (mathematics) An inflection point.
- (architecture) A pointed arch made from two ogees
- (distillation) The bubble-shaped chamber of a pot still that connects the swan neck to the pot and allows distillate to expand, condense, and fall back into the pot.
- (architecture) A double curve in the shape of an elongated S; an object of that shape
- (aesthetic facial surgery) The malar or cheekbone prominence transitioning into the mid-cheek hollow.