# On This Day

• ### 11-30-1703

Isaac Newton made president of the Royal Society, an office he held until his death in 1727.

Isaac Newton
The Royal Society
• ### 11-30-1712

William Jones elected fellow of the Royal Society. In 1706 he introduced the Greek letter pi for the ratio of the circumference of a circle to its diameter. The symbol was not generally used in this sense until Euler adopted it in 1737.