Pi
THE ANSWER
"Pi-symbol" — Photo by MarianSigler {} / Wikimedia Commons / Public domain
An irrational number, a rational obsession!
You've nailed it! This never-ending number is fundamental to all things circular. From the smallest coin to the vastest galaxy, it's always there, lurking just beyond the grasp of a finite decimal.
Explanation
Did you know?
The symbol 'π' for this number was popularized by Leonhard Euler in the 1700s, but its use dates back to the Welsh mathematician William Jones in 1706.
The 5 Clues
lightbulbClue 1
I am not round but yet, I always relates to round things.
lightbulbClue 2
Mathematicians have a special day to celebrate me.
lightbulbClue 3
Though I have no legs, I'm found everywhere from your pizza to the planets.
lightbulbClue 4
I am so irrational.
lightbulbClue 5
I am = C/d
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