noun
eleven nines; 99.999999999%
Technical term used in fields like telecommunications and computing to describe extremely high availability or reliability (99.999999999% uptime).
このシステムはイレブンナインの可用性を達成した。
This system achieved eleven nines of availability.
Variant with interpunct, sometimes used for clarity.
Refers to 99.999% availability, a more common reliability target. イレブンナイン is an even higher standard.
From English 'eleven nines', referring to the eleven 9s in 99.999999999%.