Sabin
A sabin is a unit of sound absorption area used in acoustics. It measures how much sound is absorbed by a surface.
1 sabin equals 1 square foot of perfectly absorbing surface (in imperial units) or 1 square meter (in metric units).
It helps quantify the acoustic absorption of materials in rooms or auditoriums.
Sabins are important in designing spaces with good sound quality by controlling echoes and reverberation.
Square Rod
A square rod (also called a perch or pole) is a unit of area used in land measurement. It is the area of a square with each side one rod long.
1 rod = 16.5 feet (5.029 meters)
1 square rod = 16.5 ft × 16.5 ft = 272.25 square feet ≈ 25.29 square meters
160 square rods = 1 acre
Square rods were historically used in surveying and property descriptions.