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.
Impairments can affect the ability to hear intensity (loudness, measured in decibels), pitch (frequency, measured in hertz) or both. Typically hearing loss above 90 decibels is considered deafness, according to National Dissemination Center for Children with Disabilities (NICHCY).