Summation Symbol (∑)
HTML entity for the summation symbol (∑). Learn how to use ∑ or ∑ in HTML for mathematical series, sigma notation, and formulas.
Math
∑
Summation Symbol
All Formats
| Format | Value |
|---|---|
| Character | ∑ |
| HTML Entity | ∑ |
| HTML Code (Decimal) | ∑ |
| Unicode | U+2211 |
| CSS Content | \2211 |
| Category | Math |
About Summation Symbol
The summation symbol (∑), also known as the capital sigma, is a mathematical notation used to represent the sum of a series of terms. It is one of the most recognized symbols in mathematics and appears frequently in formulas, statistical expressions, and algorithm descriptions.
In HTML, insert this symbol using ∑, ∑, or ∑. The named entity ∑ is concise and widely supported. For complete sigma notation with upper and lower bounds, combine this symbol with <sub> and <sup> elements or use MathML for more complex expressions.
The summation symbol is part of the Mathematical Operators Unicode block. It resembles an uppercase Greek letter sigma (Σ) but is a distinct character. The dedicated summation operator is typographically optimized for mathematical display, with a wider and more symmetrical appearance than the letter sigma.
In CSS, use "\2211" with the content property for pseudo-element insertion. This symbol is essential for websites covering statistics, calculus, linear algebra, and computer science. Screen readers announce it as "summation" or "n-ary summation," making mathematical content accessible.
Usage Examples
<!-- Using named entity -->
<p>This is the Summation Symbol: ∑</p>
<!-- Using numeric code -->
<p>This is the Summation Symbol: ∑</p>
<!-- Using the character directly (UTF-8) -->
<p>This is the Summation Symbol: ∑</p>
<!-- In CSS -->
.icon::before {
content: "\2211";
}FAQ
What is the HTML entity for Summation Symbol?
The Summation Symbol (∑) can be inserted using the named entity ∑, the numeric code ∑, or by pasting the character directly in a UTF-8 document.
How do I use ∑ in CSS?
In CSS, use the content property with the value "\2211". For example: content: "\2211";
What is the Unicode code point for Summation Symbol?
The Unicode code point for Summation Symbol is U+2211. This is the universal identifier for this character across all platforms and programming languages.
Try It in the HTML Entity Tool
Use our HTML Entity Encoder & Decoder to encode and decode HTML entities, convert between named, numeric, and hex formats, and explore the full entity reference table.