nines
n.— «Priding itself on its “five-nines” reliability pedigree—VeriSign’s uptime performance of running dot-net and dot-net is 100 percent—the company is guaranteeing the same reliability for operator customers.» —“VeriSign expands networks in Asia” by Jeanne Lim in Singapore ZDNet Asia June 21, 2006. (source: Double-Tongued Dictionary)
Further reading
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One secret to writing well is … there is no secret! There’s no substitute for simply sitting down day after day to practice the craft and learn from your mistakes. Plus, childhood mixups around word definitions can lead to some funny stories...