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The Au file format is a simple audio file format introduced by Sun Microsystems. The format was common on NeXT systems and on early Web pages. Originally it was headerless, being simply 8-bit Âµ-law-encoded data at an 8000 Hz sample rate. Hardware from other vendors often used sample rates as high as 8192 Hz, often integer factors of video clock signals.
One example of a publicly defined arbitrary unit is the WHO International Unit. Abbreviations and nomenclature. Abbreviations for arbitrary unit include: arb. unit, arb. u., AU, and a.u. Among these, AU and a.u. are common abbreviations for astronomical units and atomic units. For this reason, Physical Review journals, the Japanese Journal of Applied Physics, and an increasing number of other academic journals, recommend against using a.u. (Jpn. J. Appl. Phys recommends arb. unit instead).