This automatic faucet that need the hands to be between the wall and the water to turn on. - eviltoast
  • shalafi@lemmy.world
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    7 months ago

    I learned it working telecom. For example, if you wish to offer 911 service, your service has to be operational 99.999% of the time.

    It’s more casually used to mean a service or operation is insanely reliable.