Five nines
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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 Script error: No such module "convert". artillery shells used in World War I
See also
- 0.999..., a repeating decimal that is an alternative way of writing the number 1.
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