U+223A Geometric Proportion
U+223A was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Math Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+223A forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In mathematics, two sequences of numbers, often experimental data, are proportional or directly proportional if their corresponding elements have a constant ratio. The ratio is called coefficient of proportionality (or proportionality constant) and its reciprocal is known as constant of normalization (or normalizing constant). Two sequences are inversely proportional if corresponding elements have a constant product, also called the coefficient of proportionality.
This definition is commonly extended to related varying quantities, which are often called variables. This meaning of variable is not the common meaning of the term in mathematics (see variable (mathematics)); these two different concepts share the same name for historical reasons.
Two functions $f\left(x\right)$ and $g\left(x\right)$ are proportional if their ratio $\frac{f\left(x\right)}{g\left(x\right)}$ is a constant function.
If several pairs of variables share the same direct proportionality constant, the equation expressing the equality of these ratios is called a proportion, e.g., a/b = x/y = ⋯ = k (for details see Ratio). Proportionality is closely related to linearity.
Representations
System  Representation 

Nº  8762 
UTF8  E2 88 BA 
UTF16  22 3A 
UTF32  00 00 22 3A 
URLQuoted  %E2%88%BA 
HTML hex reference  ∺ 
Wrong windows1252 Mojibake  âˆº 
HTML named entity  ∺ 
L^{A}T_{E}X  \mathbin{{:}\!\!{}\!\!{:}} 
Elsewhere
Complete Record
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1.1 (1993)  
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