The shape of the yin and yang sections of the symbol, actually gives you a sense of the continual movement of these two energies, yin to yang and yang to yin, causing everything to happen: just as things expand and contract, and temperature changes from hot to cold.
Sound is measured in units called decibels. Sounds of less than 75 decibels, even after long exposure, are unlikely to cause hearing loss. However, long or repeated exposure to sounds at or above 85 decibels can cause hearing loss. The louder the sound, the shorter the amount of time it takes for NIHL to happen.
Anything in the range of 140 decibels, like a jet engine, is an immediate danger to your hearing. Exposure could create acoustic trama resulting in immediate deafness. Around 125 decibels, roughly as loud as a firecracker, is refered to as the pain threshold. It's the point where your ear interpert the level of sound as physically painful. Prolonged exposure at this level is very dangerous. The average rock concert is 120 decibels. At that volume hearing damage occurs in 7.5 minutes.