Five nines
Topics referred to by the same term
Five nines, commonly taken to mean "99.999%", may refer to:
- High availability of services, when a service is available for 99.999% of the time, or around 5 minutes of downtime per year
- Nine (purity), a 99.999% pure substance
- German 15 cm (5.9 in) artillery shells used in World War I
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