x03C7

x03C7 typically refers to the Unicode code point U+03C7, which encodes the Greek small letter chi, χ. It is part of the Greek and Coptic block and is commonly rendered as the lowercase chi in many fonts. The character is widely supported across modern computing environments and can be written in text as χ.

In the Greek alphabet, chi is the 22nd letter. Its name is chi, and it represents a voiceless fricative sound in Greek pronunciation. In modern Greek, chi is usually pronounced as a velar fricative [x] or a palatalized [ç] in certain contexts, while in classical Greek it had a different aspirated value. The uppercase form is Χ.

Chi has several notable uses in mathematics, science, and statistics. In topology and geometry, the Euler characteristic is often denoted by χ (uppercase), while in statistics and data analysis the Greek letter χ is used for the chi-squared statistic, written as χ². Beyond statistics and topology, χ appears as a general variable in equations across physics, chemistry, and engineering.

In encoding and typography, U+03C7 designates the character in Unicode, and it can be represented in HTML as χ or by the named entity χ in contexts that support it. Proper rendering depends on font support, but χ is a standard symbol available in most Greek-script fonts.

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