16.

Biography

Today we use the Greek letter as to denote the ratio of the circumference of a circle to its diameter.  But it was not always represented that way.  At one time it was designated by the letter at other times as a ratio of single letters such as /.  Presumably this last notation suggests a ratio where the designates the circumference and the designates the diameter.  The ratio of the circumference to the diameter of a circle was introduced as the single letter π in a treatise examining lengths of curves.

Who introduced it?

Author: Joseph Mazur

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William Jones (1675-1749) The modern notation for π was introduced by William Jones in Synopsis Palmariorum Matheseos, a book about lengths of curves and areas enclosed by curves, lines and planes, published in London in 1706.