The Mathematical Symbol "Equals Colon (≕)"

The ≕ Symbol in Mathematics: Equals Colon

Within the vast landscape of mathematical symbols, each one serves a unique purpose. The ≕ symbol, denoting "Equals Colon", might seem unusual at first, but it has specific applications in various mathematical contexts.


The ≕ symbol is less common than some other symbols, but when used, it typically represents a specific type of equality or a definition in certain contexts, making a distinction between the typical equality expressed by a single equals sign.


  • Example 1: In some mathematical expositions, the ≕ might be used to define a function or variable:
    \( f(x) ≕= x^2 + 2x + 1 \)
    Here, the function \( f(x) \) is defined to be \( x^2 + 2x + 1 \) using the ≕ symbol.
  • Example 2: In algebraic contexts, the symbol can be used to emphasize a resultant identity from a derivation or transformation:
    Given the equation \( ax + b = c \), after some manipulations, one might write:
    \( x ≕= \frac{c-b}{a} \)
    This usage highlights a particular result or identity in a series of manipulations or proofs.

In summary, while the ≕ symbol may not be as ubiquitous as other mathematical symbols, its purpose is to emphasize definitions or specific results, providing clarity and distinction in mathematical expressions and derivations.

Mathematical symbol 'Equals Colon'

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Codes for the ≕ Symbol

The Symbol
Alt CodeAlt 8789
HTML Code≕
HTML Entity≕
CSS Code\2255
Hex Code≕

How To Insert the ≕ Symbol

(Method 1) Copy and paste the symbol.

The easiest way to get the ≕ symbol is to copy and paste it into your document.

Bear in mind that this is a UTF-8 encoded character. It must be encoded as UTF-8 at all stages (copying, replacing, editing, pasting), otherwise it will render as random characters or the dreaded �.

(Method 2) Use the "Alt Code."

If you have a keyboard with a numeric pad, you can use this method. Simply hold down the Alt key and type 8789. When you lift the Alt key, the symbol appears. ("Num Lock" must be on.)

(Method 3) Use the HTML Decimal Code (for webpages).

HTML TextOutput
<b>My symbol: &#8789;</b>My symbol: ≕

(Method 4) Use the HTML Entity Code (for webpages).

HTML TextOutput
<b>My symbol: &ecolon;</b>My symbol: ≕

(Method 5) Use the CSS Code (for webpages).

CSS and HTML TextOutput
span:after {
content: "\2255";}
<span>My symbol:</span>
My symbol: ≕

(Method 6) Use the HTML Hex Code (for webpages and HTML canvas).

HTML TextOutput
<b>My symbol: &#x2255;</b>My symbol: ≕
On the assumption that you already have your canvas and the context set up, use the Hex code in the format 0x2255 to place the ≕ symbol on your canvas. For example:
JavaScript Text
const x = "0x"+"E9"
ctx.fillText(String.fromCodePoint(x), 5, 5);

(Method 7) Use the Unicode (for various, e.g. Microsoft Office, JavaScript, Perl).

The Unicode for ≕ is U+2255. The important part is the hexadecimal number after the U+, which is used in various formats. For example, in Microsoft Office applications (e.g. Word, PowerPoint), do the following:
[Hold down Alt]
[Press x]

(The 2255 turns into ≕. Note that you can omit any leading zeros.)
In JavaScript, the syntax is \uXXXX. So, our example would be \u2255. (Note that the format is 4 hexadecimal characters.)
JavaScript TextOutput
let str = "\u2255"
document.write("My symbol: " + str)
My symbol: ≕