Bringing it closer to home for many software developers, when we talk about the reliability of a system, we also use a variation on log probability (of success)

Bringing it closer to home for many software developers, when we talk about the reliability of a system, we also use a variation on log probability (of success), but we call it "nines:" 99% reliability is two nines, 99.99% is four nines, etc. So nines(x) = -log_10 (1-x)