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).
Summary. The principles of intravascular pressure detection and recording have been discussed. Accuracy of recording depends upon the dynamic response characteristics (frequency response and sensitivity), and the stability of the transducer system, as well as the response characteristics of the amplifier and recorder.