Nines (notation)
0Nines are an informal, logarithmic notation for proportions very near to one, or equivalently percentages very near 100%. Their common uses include grading the purity of materials.
Put simply, "nines" are the number of consecutive nines in a percentage such as 99% (two nines) or a decimal fraction such as 0.999 (three nines). The number of nines of a proportion x is
n
i
n
e
s
=
−
log
10
(
1
−
x
)
{\displaystyle \mathrm {nines} =-\log _{10}(1-x)}
However, there are different conventions for stating a non-integer number of nines. 99.5% could be expressed as "two nines five" or 2.3 nines, as outlined below. A completely pure material (x = 1) would have an infinite number of nines.
Source: https://en.wikipedia.org/wiki/Nines_(notation)
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