Capital Theta Symbol (Θ)

Copy and paste the capital theta Θ with one click

Unicode Character

Unicode Hex

U+0398

HTML Entity

Decimal Code

920

About the Capital Theta Symbol

Last reviewed on October 31, 2026

Capital Θ is the uppercase theta. Computer science uses it in Big Theta notation, written Θ(n log n), to say an algorithm grows at exactly that rate, neither faster nor slower. Lowercase θ is the one used for angles.

Its official Unicode name is Greek Capital Letter Theta. Browse the Greek Letters page for related characters.

How to Type Capital Theta on a Keyboard

Windows: Hold Alt and type 233 on the numeric keypad

Mac: Press Ctrl+Cmd+Space to open the Character Viewer, then search for the symbol by name

Microsoft Word: Type 0398 then press Alt+X

Phone & tablet: Copying Θ from this page is fastest — see our mobile typing guide

Capital Theta Code for HTML, CSS & JavaScript

HTML: Θ

CSS: content: '\0398';

JavaScript: '\u0398'

Unicode: U+0398

Frequently Asked Questions

How do I type capital theta Θ on Windows?

Hold Alt and type 233 on the numeric keypad. You can also copy Θ straight from this page.

How do I type Θ on a Mac?

Press Ctrl+Cmd+Space to open the Character Viewer, then search for the symbol by name.

What is the Unicode and HTML code for capital theta?

It is Unicode code point U+0398, named Greek Capital Letter Theta. In HTML, use Θ or the numeric reference Θ.