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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A constant is a number, for example $15,$ $\text{-}\frac{2}{3},$ and $11.327.$ In an algebraic expression, a constant is referred to as a *constant term*.

Certain constants occur often enough to be given their own symbols; one such constant is pi, which is represented by the Greek letter $\pi.$