The unit of measure of sound absorption in the inch-pound system. A measure of the sound absorption of a surface. One sabin is the equivalent to one square foot of a perfectly absorptive surface.
Named after Wallace Clement Sabine, the Harvard professor honoured as the "father of architectural acoustics" for his investigations into concert hall sound at the turn of the century.
- 1911 Sabine used this unit which he called the open window unit (owu).