Usage History of 'zzz'

The following chart shows how frequently 'zzz' appeared in printed materials over time. For example, the word 'zzz' occurred 2 times in books in 1600 and 1,346 times in 2008. From 1600 to 2008, the word 'zzz' was used a total of 31,857 times in books scanned by Google. See Reference: Google Ngram project.

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