U039E

U+039E, often written as U039E, is the Unicode code point for the Greek capital letter Xi (Ξ). It is part of the Greek and Coptic block and resides in the Basic Multilingual Plane, enabling standard encoding across most fonts and systems. The uppercase Xi glyph is Ξ, while the lowercase xi is ξ (U+03BE). Xi is the 14th letter of the Greek alphabet and represents the /ks/ sound in Greek words; in transliteration, the letter is commonly rendered as Xi. In the system of Greek numerals, Xi has the value 60.

In use, Xi appears mainly in Greek text, proper names, and scholarly contexts. Outside Greek, the symbol Xi is adopted in various scientific and mathematical notations and, in particle physics, is used to denote Xi baryons, among other context-dependent meanings.

From a technical perspective, U+039E is encoded in UTF-8 as CE 9E and in UTF-16 as 0x039E. As with other characters in the Greek and Coptic block, rendering depends on font support for Greek glyphs.