Greek Small Letter Theta

A symbol from the Math Symbols collection. Click the symbol or the button below to copy.

Symbol: θ
Unicode: U+03B8
HTML entity: θ
Category: Math Symbols

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Download Greek Small Letter Theta as a vector SVG or a raster PNG.

PNG size

SVG uses the system font stack — open in any vector editor and convert to outlines if needed. PNGs have a transparent background.

52 of 58 in the math symbols collection

About the greek small letter theta symbol

Theta (θ) is the eighth letter of the Greek alphabet. In its lowercase form, it is pronounced as a voiceless dental fricative, similar to the "th" sound in the English word "thin." While it originated as a script character within the Greek and Coptic block, it is now widely recognized as a standard letter for technical notation across various global fields.

This symbol frequently appears in mathematical and scientific contexts to represent specific variables. It is most commonly used in geometry and trigonometry to denote an unknown angle. Additionally, theta serves as a variable in polar coordinate systems and represents potential temperature in meteorology. In phonetic transcription, the character is used within the International Phonetic Alphabet to indicate the specific "th" consonant sound.

How to type Greek Small Letter Theta

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 03B8 then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 03B8.
Or: Control + Command + Space opens the Character Viewer — search by name.