U+2236 Ratio
U+2236 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. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. If its East Asian Width is “narrow”, U+2236 forms a word with similar characters, which prevents a line break inside it. Otherwise it allows line breaks around it, except in some numeric contexts. The glyph can be confused with one other glyph.
The CLDR project calls this character “ratio” for use in screen reading software.
The Wikipedia has the following information about this codepoint:
In mathematics, a ratio () shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and the ratio of oranges to the total amount of fruit is 8:14 (or 4:7).
The numbers in a ratio may be quantities of any kind, such as counts of people or objects, or such as measurements of lengths, weights, time, etc. In most contexts, both numbers are restricted to be positive.
A ratio may be specified either by giving both constituting numbers, written as "a to b" or "a:b", or by giving just the value of their quotient a/b. Equal quotients correspond to equal ratios. A statement expressing the equality of two ratios is called a proportion.
Consequently, a ratio may be considered as an ordered pair of numbers, a fraction with the first number in the numerator and the second in the denominator, or as the value denoted by this fraction. Ratios of counts, given by (nonzero) natural numbers, are rational numbers, and may sometimes be natural numbers.
A more specific definition adopted in physical sciences (especially in metrology) for ratio is the dimensionless quotient between two physical quantities measured with the same unit. A quotient of two quantities that are measured with different units may be called a rate.
Representations
System  Representation 

Nº  8758 
UTF8  E2 88 B6 
UTF16  22 36 
UTF32  00 00 22 36 
URLQuoted  %E2%88%B6 
HTML hex reference  ∶ 
Wrong windows1252 Mojibake  âˆ¶ 
HTML named entity  ∶ 
Adobe Glyph List  ratio 
digraph  :R 
Related Characters
Confusables
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
RATIO  
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Math Symbol  
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Other Neutral  
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R 