Usage History of 'pi'

The following chart shows how frequently 'pi' appeared in printed materials over time. For example, the word 'pi' occurred 2 times in books in 1505 and 301,550 times in 2008. From 1505 to 2008, the word 'pi' was used a total of 12,111,693 times in books scanned by Google. See Reference: Google Ngram project.

See also:

Words starting with a,b,c...
Words ending with a,b,c...
Words starting & ending with a,b,c....