Two lines with a squiggly line over it.
It is the lower case Greek letter 'p' and looks a bit like π
It can be inserted in many programs (when using Windows) by holding down the 'Alt' key and typing 227 π
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William Jones first used the pi symbol (π) in 1706
William Jones, a Welsh mathematician, first used the pi symbol in 1706.
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The symbol comes from the Greek alphabet.
Pi Day can be celebrated by eating a pie, discussing topics related to pi, dressing in pi-ralated apparel, such as a shirt with the pi symbol on it, or doing anything else related to pi.