U+2254 Colon Equals
U+2254 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 mirrored into
The Wikipedia has the following information about this codepoint:
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for expressing all mathematics.
The most basic symbols are the decimal digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9), and the letters of the Latin alphabet. The decimal digits are used for representing numbers through the Hindu–Arabic numeral system. Historically, uppercase letters were used for representing points in geometry, and lowercase letters were used for variables and constants. Letters are used for representing many other sorts of mathematical objects. As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are also used. In mathematical formulas, the standard typeface is italic type for Latin letters and lowercase Greek letters, and upright type for upper case Greek letters. For having more symbols, other typefaces are also used, mainly boldface $a,A,b,B,\dots $, script typeface $A,B,\dots $ (the lowercase script face is rarely used because of the possible confusion with the standard face), German fraktur $a,A,b,B,\dots $, and blackboard bold ${N,Z,Q,R,C,H,F}_{q}$ (the other letters are rarely used in this face, or their use is unconventional).
The use of Latin and Greek letters as symbols for denoting mathematical objects is not described in this article. For such uses, see Variable (mathematics) and List of mathematical constants. However, some symbols that are described here have the same shape as the letter from which they are derived, such as $\prod $ and $\sum $.
These letters alone are not sufficient for the needs of mathematicians, and many other symbols are used. Some take their origin in punctuation marks and diacritics traditionally used in typography; others by deforming letter forms, as in the cases of $\in $ and $\forall $. Others, such as + and =, were specially designed for mathematics.
Representations
System  Representation 

Nº  8788 
UTF8  E2 89 94 
UTF16  22 54 
UTF32  00 00 22 54 
URLQuoted  %E2%89%94 
HTML hex reference  ≔ 
Wrong windows1252 Mojibake  â‰” 
HTML named entity  ≔ 
HTML named entity  ≔ 
HTML named entity  ≔ 
L^{A}T_{E}X  := 
Related Characters
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
COLON EQUALS  
COLON EQUAL  
Mathematical Operators  
Math Symbol  
Common  
Other Neutral  
Not Reordered  
none  


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Any  
✔  
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0  
0  
0  
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None  
—  
NA  
Other  
—  
✘  
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✔  
✘  
Yes  
Yes  


Yes  


Yes  
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None  
neutral  
Not Applicable  
—  
No_Joining_Group  
Non Joining  
Alphabetic  
none  
not a number  


R 