Greek Capital Letter Psi Ψ

The Greek Capital Letter Psi character (Ψ) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference Ψ, the decimal numeric character reference Ψ, or the hexadecimal numeric reference Ψ. The character is assigned Unicode code point U+03A8 in the Universal Character Set.

Greek capital psi (Ψ) has a distinctive trident shape and is the official symbol of psychology. It represents the wave function in quantum mechanics (Ψ), the supergolden ratio in mathematics, and is used in various engineering contexts. Its unique visual form makes it one of the most recognizable Greek capitals.

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 Capital Letter Psi character in your HTML documents, the named entity Ψ is generally the most readable choice for developers reviewing or maintaining source code. The decimal form Ψ and hexadecimal form Ψ 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 capital psi entity as the symbol of psychology, in quantum mechanics (wave function Ψ), and in contexts where a visually distinctive Greek letter is needed. Its trident shape is iconic and widely recognized even outside scientific contexts.