Square Pole
A square pole is another name for a square rod or square perch, a traditional unit of area used in land measurement.
1 pole (rod) = 16.5 feet
1 square pole = 16.5 ft × 16.5 ft = 272.25 square feet ≈ 25.29 square meters
160 square poles = 1 acre
Square poles have historically been used in surveying and describing land parcels.
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.