If you've ever seen a Jewish man with strings hanging out of his clothing, this is probably what you were seeing. There is no particular religious significance to the tallit (shawl) itself, other than the fact that it holds the tzitzit (fringes) on its corners.
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).
Sound pressure is what our ears hear, what sound meters measure ... and what ultimately determines whether a design achieves quality sound. The sound pressure level in a space may be estimated when sufficient information is available from the Lw of motor and the acoustical characteristics of the space.