The plural of nine; the number 9 repeated or grouped multiple times.
From Old English 'nigon,' related to Germanic and Indo-European roots meaning nine. One of humanity's oldest number words, appearing in virtually all ancient languages. The 's' is the standard plural suffix.
The number nine appears obsessively in nature: a cat has nine lives in folklore, there are nine planets in older astronomy, and Google's infrastructure is nicknamed '9s'—meaning it has 99.9999999% uptime! Nine has mystical significance across cultures.
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