Greek Capital Letter Kappa Κ

The Greek Capital Letter Kappa character (Κ) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference Κ, the decimal numeric character reference Κ, or the hexadecimal numeric reference Κ. The character is assigned Unicode code point U+039A in the Universal Character Set.

Greek capital kappa is visually identical to the Latin capital letter K. It appears in Greek text and occasionally in mathematical notation. The lowercase κ is far more common in scientific usage, particularly for Cohen's kappa coefficient.

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 Kappa character in your HTML documents, the named entity Κ is generally the most readable choice for developers reviewing or maintaining source code. The decimal form Κ and hexadecimal form Κ 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 kappa entity in Greek-language text and educational content. For scientific notation, the lowercase kappa (κ) is standard. Cohen's Kappa is sometimes written with a capital K in text but uses the lowercase Greek letter in formulas.