0x399

0x399 is a hexadecimal literal commonly used in computer programming to denote the integer value 921. In hexadecimal notation, the prefix 0x signals that the following digits are base-16. The digits 3, 9, and 9 correspond to 3×256, 9×16, and 9, which sum to 921.

In source code across languages such as C, C++, Java, JavaScript, and Python, 0x399 represents a numeric constant. Depending on the context, it may serve as a plain numeric value, a bitmask, a memory address, or part of a data structure that stores multiple fields within a compact width. While 0x-style literals are common for numbers, color codes are typically written without the 0x prefix and use 3- or 6-digit forms.

The same numeric value that 0x399 represents also appears in Unicode terminology: 921 decimal equals the code point U+0399, the Greek capital letter Iota. Thus 0x399 can be interpreted as the hexadecimal form of that code point, though in practice the Unicode notation uses the U+0399 form. This illustrates how the same value can arise in different encoding contexts.

Related topics include the hexadecimal numeral system, the 0x prefix used to denote hex literals, and Unicode code points such as U+0399. The practical meaning of 0x399 depends on the surrounding context within software, data formats, or encoding schemes.