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The symbol 's' is so often used for displacement because the symbol 'd' is often chosen for distance. This is an important distinction in physic â¦ s, where differences between scalar (distance) and vector (displacement) types are used to measure and describe different things.hether s (or d) is used to indicate distance or displacement, the distinction is that a right-facing arrow is placed over the letter to indicate displacement since it is a vector quantity.
An astronomical unit (AU) is a measure of distance often used in astronomy, equal to the distance between the Earth and the Sun. In terms of more common units of measurement, an AU is equal to about 93 million miles (150 million km), or the distance light travels in a little over eight minutes. The symbol AU is most often used to represent the astronomical unit, though less commonly you may see UA used instead.