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 the amount of air pressure fluctuation a noise source creates. We hear or perceive sound pressure as loudness. If the drum in our example (Figure 1) is hit very lightly, the surface moves only a very short distance and produces weak pressure fluctuations and a faint sound.