Theta symbol (θ)
U+03B8 · GREEK SMALL LETTER THETA · Unicode 1.1 (1993)
How to type θ
Windows
No Alt code
θ is not in the Windows code pages 1252 or 437, so it has no Alt code. Use one of the methods below or copy it from this page.
Word and Outlook: Alt + X
03B8 Alt+X
Type 03B8 and press Alt+X right after it: Word turns the code into θ. Press Alt+X again to turn it back into the code.
Emoji and symbols panel (Windows 10 and 11)
Win+.
Press Win + full stop (.) to open the panel, go to the Symbols tab (Ω) and pick θ.
No numeric keypad on your laptop? See the other ways in our Alt codes guide.
Mac
Character Viewer
Ctrl+⌘ Cmd+Space
Press Ctrl+⌘+Space (or the Globe key + E), search for “theta symbol” and click θ to insert it.
iPhone
Make a shortcut (Text Replacement)
Turn a short word into θ once and type it in any app:
- Copy θ from this page.
- Open Settings › General › Keyboard › Text Replacement and tap +.
- Paste θ as the Phrase and type a Shortcut, for example ;theta.
- Now type ;theta anywhere: the keyboard suggests θ.
Android
Make a shortcut (Gboard personal dictionary)
Teach your keyboard a short word that turns into θ:
- Copy θ from this page.
- Open Gboard settings › Dictionary › Personal dictionary, choose your language and tap +.
- Paste θ as the word and type a shortcut, for example ;theta.
- Type ;theta in any app and tap θ in the suggestions.
Linux
Unicode input
Ctrl+Shift+U 03b8 Enter
Press Ctrl+Shift+U, type 03b8 and press Enter or Space. Works in GTK apps and with IBus (GNOME, Ubuntu, Fedora).
What θ means and how it is used
Theta θ is the Greek letter most often used for angles in geometry, trigonometry and physics: sin θ, polar coordinates (r, θ). Engineers also use it for temperature and for phase. Its capital Θ appears in computer science for tight bounds, as in Θ(n log n).
In Unicode, θ is code point U+03B8 with the official name GREEK SMALL LETTER THETA. It belongs to the Greek and Coptic block and arrived with Unicode 1.1 in 1993.
You will find it in our greek, 69 symbols in all, together with α β γ Δ λ.
Codes for HTML, CSS and JavaScript
Tap Copy next to the code you need.
| HTML entity | θ | |
|---|---|---|
| HTML decimal | θ | |
| HTML hex | θ | |
| CSS | content: "\03B8"; | |
| JavaScript | \u03B8 | |
| URL | %CE%B8 | |
| UTF-8 bytes | CE B8 | |
| Unicode | U+03B8 |
Will it show on my friend's phone?
Very likely yes: θ dates from Unicode 1.1 (1993), so every current system has a font for it.
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Names in other languages
What θ is called in the 12 languages of this site (Unicode CLDR and our editors). Tap a name to open that language's page.
| Language | Name |
|---|---|
| English | Theta symbol |
| Português | Símbolo teta |
| Español | Símbolo theta |
| Italiano | Simbolo theta |
| Français | Symbole thêta |
| Deutsch | Theta-Zeichen |
| Türkçe | Teta sembolü |
| Bahasa Indonesia | Simbol teta |
| Polski | Symbol theta |
| Русский | Символ тета |
| 日本語 | シータ記号 |
| 한국어 | 세타 기호 |
Related symbols
All Greek →Questions people ask
How do I type θ on a laptop without a numeric keypad?
On Windows press Win + full stop (.) and pick θ in the Symbols tab, or in Word type 03B8 and press Alt+X.
How do I type θ on an iPhone?
The iPhone keyboard has no key for θ. Copy it here, then add it in Settings › General › Keyboard › Text Replacement with a shortcut like ;theta.
What is the HTML code for the theta symbol?
Use the entity θ or the numeric code θ (hex θ). In CSS write \03B8, in JavaScript \u03B8.
Will θ show on every phone?
Very likely yes: θ dates from Unicode 1.1 (1993), so every current system has a font for it.