Σ Sigma summation symbol
The sigma summation symbol is known by most as a mathematical symbol that indicades the sum. Sigma Σ is one of the most popular mathematic signs which means a summation of something. Click on a Sigma symbol below to copy it out to clipboard automatically. Or look below to find out how to type sum symbol with keyboard using different techniques depending on your system.
| Maths | Σ | ∫ |
|---|---|---|
| ½ | π |
| Maths Emoji | ➕ | ➖ |
|---|---|---|
| ✖ | ➗ |
What Sigma means
The name of sigma, according to one theory, may continue that of Phoenician Samekh. According to a different theory, its original name may have been "San" , while "Sigma" was a Greek innovation that simply meant "hissing", based on a nominalization of a verb σίζω. Sigma is also used for the the summation operator, a class of baryons in particle physics, macroscopic cross sections in nuclear and particle physics, self-energy in condensed matter physics, the balance of the invoice classes and the overall amount of the debts and demands in economics, the set of symbols that form an alphabet in linguistics and computer science,etc. Read Wikipedia article on sum symbol to find out more about its meaning.
How to input sigma symbol
Choose your system and find out.
WindowsFrom Keyboard
Alt Codes
Shortcut technique that works on Desktops and most Laptops running MS Windows. You press Alt and, while holding it, type a code on Num Pad while it's turned on. Please, read a guide if you're running a laptop. You can type many frequently used symbols with this method.
| Alt code | Symbol |
|---|---|
| 0228 | Σ |
Shift States
Configure your keyboard layout in Windows so that you can type all additional symbols you want as easy as any other text. Takes about 5-10 minutes to set things up, but you'll be typing like a boss. You can assign sigma symbol σ and any other text characters to your keyboard using this technique.
Character Map
CharMap allows you to view and use all characters and symbols available in all fonts (some examples of fonts are "Arial", "Times New Roman", "Webdings") installed on your computer. You can input sigma symbol using it.
Emoji on iOS (iPhone, iPad and iPod touch)
Keyboard viewer
You can make frequently used technical non-fancy symbols like "√ ∑ π ∞ ∆ ™ © æ £ ¢" and åccénted letters on Mac using [Option] key. I've compiled a list of shortcuts in my article and explained how to open keyboard viewer. You can also use your Keyboard Viewer as an alternative to my list.
[Option] + [W] produces Σ sigma sign.
Character Palette
Character Palette allows you to view and use all characters and symbols, including sigma, available in all fonts (some examples of fonts are "Arial", "Times New Roman", "Webdings") installed on your computer.
From Keyboard
| Unicode hex code | Symbol | Compose key sequence | Symbol |
|---|---|---|---|
| 03A3 | Σ | *S | Σ |
There actually are 3 different ways to type symbols on Linux with a keyboard. And all of them can produce sigma text symbol.
Character map
Character map allows you to view and use all characters and symbols available in all fonts (some examples of fonts are "Arial", "Times New Roman", "Webdings") installed on your computer. It can also help you lookup Unicode codes for entering symbols with keyboard.
Following is a list of HTML and JavaScript entities for sigma symbol. In Javascript you should write like a = "this \u2669 symbol" if you want to include a special symbol in a string.
| HTML entity | JS entity | Symbol |
|---|---|---|
| Σ | \u03A3 | Σ |