Sigma Symbol \u03A3 Copy & Paste: Math, Stats & More
The sigma symbol is one of the most recognizable Greek letters in mathematics and science. Whether you need the capital \u03A3 for summation, the lowercase \u03C3 for standard deviation, or the final form \u03C2 used in Greek writing, every variant is right here. Click any symbol to copy it.
All Sigma Symbols
Here is every sigma variant available in Unicode, along with its name, code point, and a copy-ready character.
| Symbol | Name | Unicode | Copy |
|---|---|---|---|
| Σ | Capital Sigma (Summation) | U+03A3 | Σ |
| σ | Small Sigma | U+03C3 | σ |
| ς | Final Sigma (word-end) | U+03C2 | ς |
What Does Sigma Mean?
Sigma is the 18th letter of the Greek alphabet. In modern usage, it has several important meanings depending on whether you use the uppercase or lowercase form.
Capital \u03A3 — Summation
In mathematics, the capital sigma \u03A3 represents summation. It tells you to add up a series of numbers. For example, \u03A3 from i=1 to n means "add up all values from the first to the nth." This notation appears everywhere from basic algebra to advanced calculus and statistics.
Lowercase \u03C3 — Standard Deviation
In statistics, the lowercase sigma \u03C3 represents standard deviation, which measures how spread out a set of numbers is. A small \u03C3 means the data points cluster close to the average. A large \u03C3 means they are spread out over a wider range.
Other Uses
- Physics: Surface charge density, electrical conductivity, stress
- Chemistry: Sigma bonds (the strongest type of covalent bond)
- Engineering: Normal stress in mechanics
- Finance: Volatility of an investment
- Six Sigma: A quality management methodology aiming for near-zero defects
How to Type Sigma on Keyboard
Windows
- Alt codes: Hold Alt, type 228 for \u03C3, or Alt + 229 for \u03A3 (on the numeric keypad)
- Character Map: Open Character Map, search "sigma," double-click to select, click Copy
- Microsoft Office: Insert > Symbol > Greek and Coptic subset > select Sigma
Mac
- Character Viewer: Press Control+Command+Space, search "sigma," double-click to insert
- Greek keyboard: Add Greek keyboard in System Settings, then press "s" for \u03C3 or Shift+S for \u03A3
Mobile (iOS & Android)
The easiest way on mobile is to copy from this page. Alternatively, add a Greek keyboard in your phone settings and press the "s" key to get \u03C3.
LaTeX Commands
If you are writing mathematical documents in LaTeX, use these commands:
| Symbol | LaTeX Command | Output |
|---|---|---|
| Capital Sigma | \Sigma | Σ |
| Small Sigma | \sigma | σ |
| Summation | \sum_{i=1}^{n} | Σ with limits |
| Final Sigma | \varsigma | ς |
HTML Entities
To use sigma symbols in HTML:
| Render | Named Entity | Decimal Code |
|---|---|---|
| Σ | Σ | Σ |
| σ | σ | σ |
| ς | ς | ς |
Sigma in Six Sigma
Six Sigma is a data-driven quality management methodology developed by Motorola in the 1980s. The name comes from the statistical concept: a "six sigma" process produces fewer than 3.4 defects per million opportunities. It represents near-perfection in quality control.
The methodology uses a belt system similar to martial arts (Yellow Belt, Green Belt, Black Belt, Master Black Belt) to certify expertise levels. Companies like General Electric, Toyota, and Amazon use Six Sigma principles to improve processes and reduce errors.
Quick Copy Section
All sigma symbols in one place for fast copying:
Σ σ ς
Highlight any symbol above, copy it, and paste wherever you need it. That is all there is to it.