ten nines (99.99999999%)
Technical term used in computing and engineering to describe extremely high availability or purity, often in the context of 'five nines' (99.999%) or 'nine nines' reliability.
This system achieves ten nines of availability.
Variant spelling with a middle dot; less common but seen in some technical contexts.
Loanword from English 'ten nines', referring to the decimal representation 99.99999999%.