π is the Greek symbol for the value of a circle’s circumference divided by its diameter. Pi is the first irrational number (a real number that cannot be expressed as a ratio of integers) that I ever came across. The elementary-school arithmetic books only took pi out to four digits, i.e. 3.1416, but that felt unsatisfying. I looked up pi in the library and memorized it to eight digits,3.14159265. After high school I never had to use pi in a calculation, but I still know it, just like long-defunct telephone numbers.
BTW there was a lunar eclipse today. The congruence of the moon and pizza on the same day prompted me to play the 1953 Dean Martin hit while munching on Toto's #2.
When the moon hits your eye
Like a big pizza pie, that's amore
When the world seems to shine
Like you've had too much wine, that's amore
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