Greek Small Letter Iota ι

The Greek Small Letter Iota character (ι) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference ι, the decimal numeric character reference ι, or the hexadecimal numeric reference ι. The character is assigned Unicode code point U+03B9 in the Universal Character Set.

Iota is the ninth letter of the Greek alphabet and the smallest letter in the classic Greek script. In English, 'iota' has come to mean 'a very small amount.' In mathematics, it can represent the inclusion map or an imaginary unit in some notations. In linguistics, it is significant in the study of Greek vowels.

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 Small Letter Iota character in your HTML documents, the named entity ι is generally the most readable choice for developers reviewing or maintaining source code. The decimal form ι and hexadecimal form ι 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 iota entity in mathematical contexts for inclusion maps, in linguistic discussions of Greek vowels, and in educational content about the Greek alphabet. Its metaphorical meaning ('not one iota of difference') makes it culturally relevant beyond technical usage.