Usage History of 'triads'

The following chart shows how frequently 'triads' appeared in printed materials over time. For example, the word 'triads' occurred 2 times in books in 1650 and 25,014 times in 2008. From 1650 to 2008, the word 'triads' was used a total of 678,090 times in books scanned by Google. See Reference: Google Ngram project.

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