0X

0X or 0-X ("zero/oh ex") may refer to:

Computing

 * 0x, prefix for a hexadecimal numeric constant
 * 0x (decentralized exchange infrastructure), a blockchain protocol
 * C++11, standard for the C++ programming language (previously C++0x)

In fiction

 * Zero-X, a spacecraft from the Thunderbirds and Captain Scarlett puppet series
 * $\overline{0X}$, a living cellular automaton from the Of Man and Manta novels

Vehicle

 * Zero X, an electric motorcycle model