1-minute answer
To type Σ: Word: 03A3 then Alt+X · Mac Character Viewer · HTML Σ. Click the key above to copy it now.
01 All shortcuts at a glance
| Platform | Shortcut | |
|---|---|---|
| Windows (any app) | Win+. or Win+; emoji/symbol picker, or Character Map (Win+R → charmap) |
|
| Mac | Control+Command+Space to open Character Viewer, search "Greek Capital Letter Sigma" |
|
| Word / Outlook | Type 03A3, then press Alt+X |
|
| Linux (IBus) | Ctrl+Shift+U, then 03a3, then Enter |
|
| HTML / CSS | Σ · \03a3 (CSS) |
02 Step by step, per platform
A real, followable procedure for every platform — not a thin restatement of the shortcut.
Windows
- Open Character Map: Win+R, type charmap, press Enter.
- Search or scroll for Greek Capital Letter Sigma (U+03A3).
- Select it, click Copy, then paste where you need it.
Mac
- Press Control+Command+Space to open the Character Viewer.
- Type "Greek Capital Letter Sigma" in the search field.
- Double-click the result to insert it.
Microsoft Word
- Type 03A3.
- Press Alt+X immediately after — it converts the hex code to Σ.
03 Characters in this set
04 Troubleshooting & confusables
| Looks like it | But it's actually | When to use |
|---|---|---|
| ∑ | N-ary Summation (U+2211) | Different character, different meaning \xe2\x80\x94 check before copying. |
05 FAQ
What is the Unicode code point for Greek Capital Letter Sigma?
Greek Capital Letter Sigma is U+03A3. In HTML that's <code>Σ</code> or <code>Σ</code>.
Why doesn't Greek Capital Letter Sigma have a classic Windows Alt code?
Alt codes only cover the legacy 256-character Windows-1252 codepage. Greek Capital Letter Sigma is outside that range, so use Character Map, the Word Alt+X method, or copy it from this page instead.
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