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Five nines, commonly taken to mean "99.999%", may refer to:
- High availability of services, when the downtime is less than 5.26 minutes per year (This article has a table that shows the conversion from "nines" to the amount of time a system would be unavailable for various periods.)
- Nine (purity), a 99.999% pure substance
- German 15 cm (5.9 in) artillery shells used in World War I
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