The Mathematical Symbol "Ring Equal To (≗)"

The "Ring Equal To" Symbol (≗)

The ≗ symbol, commonly known as the "Ring Equal To", is a mathematical notation used to represent a specific kind of equality or equivalence that's distinct from the conventional equality denoted by the equals sign.

Usage of ≗

The ≗ is not as commonly encountered in basic math as the standard equals sign, but it has significance in particular areas of advanced mathematics, especially in relation to congruence relations and equivalence classes.

Example 1: Congruence Relations

If we're working in modular arithmetic, and we say that two numbers a and b are congruent modulo n, we might use the ≗ symbol to express this relationship. For instance, "7 ≗ 2 (mod 5)" would mean that 7 and 2 have the same remainder when divided by 5.

Example 2: Equivalence Classes

In abstract algebra and other areas, ≗ can be used to denote that two elements belong to the same equivalence class. This means that they share a specific relationship or property that groups them together within a larger set.

Significance in Advanced Mathematics

Even though ≗ might be less known compared to more standard mathematical symbols, it is indispensable in certain advanced mathematical contexts:

  • Specificity: The ≗ allows mathematicians to distinguish between general equality and the particular equivalence or congruence relations they wish to denote.
  • Universal Language: Mathematical symbols like ≗ provide a universal language that transcends linguistic barriers, enabling global collaboration and understanding among researchers.
  • Compactness: Symbols like this enable concise representation of complex concepts, facilitating clearer and more efficient communication of mathematical ideas.

To sum up, the ≗ symbol, while perhaps esoteric to those outside specific mathematical domains, plays a crucial role in denoting specific types of equality or equivalence in advanced contexts. Understanding such symbols extends the depth and breadth of mathematical knowledge and communication.

Mathematical symbol 'Ring Equal To'

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Codes for the ≗ Symbol

The Symbol
Alt CodeAlt 8791
HTML Code≗
HTML Entity≗
CSS Code\2257
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 8791. 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: &#8791;</b>My symbol: ≗

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

HTML TextOutput
<b>My symbol: &cire;</b>My symbol: ≗

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

CSS and HTML TextOutput
span:after {
content: "\2257";}
<span>My symbol:</span>
My symbol: ≗

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

HTML TextOutput
<b>My symbol: &#x2257;</b>My symbol: ≗
On the assumption that you already have your canvas and the context set up, use the Hex code in the format 0x2257 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+2257. 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 2257 turns into ≗. Note that you can omit any leading zeros.)
In JavaScript, the syntax is \uXXXX. So, our example would be \u2257. (Note that the format is 4 hexadecimal characters.)
JavaScript TextOutput
let str = "\u2257"
document.write("My symbol: " + str)
My symbol: ≗