Gabriel's horn is the surface obtained by revolving the graph of y = 1 / x {\displaystyle y=1/x\,} for x ≥ 1 {\displaystyle x\geq 1} about the x {\displaystyle x} -axis. It is noteworthy for having infinite area, but enclosing a finite volume (in the region with x ≥ 1 {\displaystyle x\geq 1} ) of π {\displaystyle \pi \,} cubic units.
