Percentage

A percentage is a number or ratio expressed as a fraction of 100
It is often denoted using the percent sign, %.
A percentage is a dimensionless or pure number.
45% (read "forty-five percent") = 45/100 = 45:100 = 0.45
Percentages are often used to express a proportionate part of a total.
the term "percent" is derived from the Latin per centum "by the hundred"
the percent symbol evolved by gradual contraction of the Italian per cento "for a hundred". "per" was often abbreviated as "p." and eventually disappeared; "cento" was contracted to two circles separated by a horizontal line, which evolved into the modern symbol.

Parts per $10^i$ where $i=\{2,3,4\}$

$\%$ indicates parts per hundred, $10^2$ % (percent), ﹪ % ％
$‰$ indicates parts per thousand, $10^3$ ‰
- spelled: per mil, per mill, permil, permill, permille, promille
$‱$ indicates parts per ten thousand, $10^4$ ‱

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A percentage is a number or ratio expressed as a fraction of 100
It is often denoted using the percent sign, %.
A percentage is a dimensionless or pure number.
45% (read "forty-five percent") = 45/100 = 45:100 = 0.45
Percentages are often used to express a proportionate part of a total.
the term "percent" is derived from the Latin per centum "by the hundred"
the percent symbol evolved by gradual contraction of the Italian per cento "for a hundred". "per" was often abbreviated as "p." and eventually disappeared; "cento" was contracted to two circles separated by a horizontal line, which evolved into the modern symbol.

Parts per $10^i$ where $i=\{2,3,4\}$

$\%$ indicates parts per hundred, $10^2$ % (percent), ﹪ % ％
$‰$ indicates parts per thousand, $10^3$ ‰
- spelled: per mil, per mill, permil, permill, permille, promille
$‱$ indicates parts per ten thousand, $10^4$ ‱