The Mathematical Symbol "Proportion (∷)"

The "Proportion" Symbol (∷): A Fundamental Ratio Notation

The world of mathematics is rich with symbols, each carrying its unique significance. The ∷ symbol, known as the "Proportion" notation, is among such vital symbols. Often used in geometry, algebra, and other branches of mathematics, it denotes a relationship of equality between two ratios. This article will delve into the intricacies of the ∷ symbol and its primary applications.

Understanding the ∷ Symbol

The concept of proportionality is essential in many mathematical scenarios. A proportion is an equation that expresses the equality of two ratios. The ∷ symbol is used to convey this relationship succinctly.

Example 1: Direct Proportionality

If two quantities \(a\) and \(b\) are directly proportional, and two other quantities \(c\) and \(d\) also maintain the same ratio, the relationship can be expressed as \(a : b ∷ c : d\).

Example 2: Geometry and Ratios

In triangles, if the sides of one triangle are in proportion to the sides of another triangle, this relationship of proportionality can be represented using the ∷ symbol. For instance, if triangle ABC is similar to triangle DEF, and the sides are proportional, it can be expressed as \(AB : DE ∷ BC : EF\).

Applications of the ∷ Symbol

The ∷ symbol finds its place in various mathematical contexts:

  • Mathematics: To denote ratios in algebra, geometry, and arithmetic.
  • Physics: To represent proportionality constants or relationships between variables.
  • Statistics: In expressing odds or likelihoods of events.
  • Economics: For indicating growth rates or other ratios of interest.

The notation, while simple, provides an elegant way to express complex relationships between numbers, quantities, or even functions. It's a testament to how mathematics often distills intricate ideas into concise symbols.

In summary, the ∷ symbol plays an instrumental role in representing proportions, an idea fundamental to various scientific, economic, and mathematical disciplines. Its utility underscores the beauty and precision of mathematical notation.

Mathematical symbol 'Proportion'

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Codes for the ∷ Symbol

The Symbol
Alt CodeAlt 8759
HTML Code∷
HTML Entity∷
CSS Code\2237
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 8759. 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: &#8759;</b>My symbol: ∷

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

HTML TextOutput
<b>My symbol: &Colon;</b>My symbol: ∷

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

CSS and HTML TextOutput
span:after {
content: "\2237";}
<span>My symbol:</span>
My symbol: ∷

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

HTML TextOutput
<b>My symbol: &#x2237;</b>My symbol: ∷
On the assumption that you already have your canvas and the context set up, use the Hex code in the format 0x2237 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+2237. 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 2237 turns into ∷. Note that you can omit any leading zeros.)
In JavaScript, the syntax is \uXXXX. So, our example would be \u2237. (Note that the format is 4 hexadecimal characters.)
JavaScript TextOutput
let str = "\u2237"
document.write("My symbol: " + str)
My symbol: ∷