Usage History of 'phi'

The following chart shows how frequently 'phi' appeared in printed materials over time. For example, the word 'phi' occurred 1 time in books in 1507 and 64,299 times in 2008. From 1507 to 2008, the word 'phi' was used a total of 3,030,753 times in books scanned by Google. See Reference: Google Ngram project.

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