What is 0 x?

0 x, also known as hexadecimal or hex, is a numbering system that uses 16 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F. Each digit holds a value between 0 and 15, with A being equivalent to 10, B being 11, and so on up to F being 15. The prefix "0x" is often used to denote a hexadecimal number, with the leading zero indicating that the number is in hex.

Hexadecimal is commonly used in computer science and programming, particularly in contexts such as memory addressing, color codes in web design, and binary code translation. It is often used as a shorthand for large binary numbers, as each hex digit corresponds to four bits in binary (16 possible values = 2^4).

Note that in mathematical notation, a leading zero is not necessary for indicating a hex number: for example, the number 5F can be written without the "0x" prefix and still be understood as a hexadecimal value.