Greek Theta Symbol ϑ

The Greek Theta Symbol character (ϑ) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference ϑ, the decimal numeric character reference ϑ, or the hexadecimal numeric reference ϑ. The character is assigned Unicode code point U+03D1 in the Universal Character Set.

The Greek theta symbol (ϑ) is a cursive variant of theta used in some mathematical and scientific notation. It is sometimes used to distinguish a variant meaning from the standard theta (θ). The curly form appears in certain physics and mathematics traditions.

Greek letter entities are indispensable for scientific papers, engineering documentation, statistical analyses, and mathematical content published on the web. From physics equations using alpha and omega to statistical formulas featuring sigma and mu, these entities allow content authors to include Greek characters reliably without requiring specialized fonts or complex Unicode input methods on the keyboard.

When deciding how to encode the Greek Theta Symbol character in your HTML documents, the named entity ϑ is generally the most readable choice for developers reviewing or maintaining source code. The decimal form ϑ and hexadecimal form ϑ are equally valid alternatives that work in contexts where named entities may not be supported, or when generating HTML output programmatically from server-side code. All three representations produce identical visual output in every modern web browser.

Use the theta symbol variant when a mathematical or physics convention requires the cursive theta form. In some notation systems, the standard θ and the variant ϑ carry different meanings. The distinction is important in publications that follow strict typographic conventions.