Pi Day not Pie Day

３月14日は「円周率の日」*1。
Wikipediaのツィート；

Today is pi day, the annual celebration of the mathematical constant π.

Notably, it does not celebrate pie the food.https://t.co/JVV1yjdW0N pic.twitter.com/YGVsTEuiIj

— Wikipedia (@Wikipedia) 2020年3月14日

See also
「πの日」https://nessko.hatenadiary.jp/entry/2020/03/14/123434

*1:https://sumita-m.hatenadiary.com/entry/20160315/1457997788 https://sumita-m.hatenadiary.com/entry/2019/03/15/160544 https://sumita-m.hatenadiary.com/entry/2019/03/17/011607