X0 may refer to:
Grammar
* X
0, denoting a sentence component
**
Zero-level projection, in X-bar theory
**
Head (linguistics)
In linguistics, the head or nucleus of a phrase is the word that determines the syntax, syntactic category of that phrase. For example, the head of the noun phrase "boiling hot water" is the noun (head noun) "water".
Analogously, the head of a c ...
, or nucleus
Science, technology and mathematics
*
SpaceShipOne flight 15P
Flight 15P of SpaceShipOne (X0) was the first privately funded human spaceflight. It took place on June 21, 2004. It was the fourth powered test flight of the Tier One program, with the previous three test flights reaching much lower altitude ...
, a 2004 private spaceflight
*
X/0, division by zero
*
Turner syndrome
Turner syndrome (TS), commonly known as 45,X, or 45,X0,Also written as 45,XO. is a chromosomal disorder in which cells of females have only one X chromosome instead of two, or are partially missing an X chromosome (sex chromosome monosomy) lea ...
, a disorder in which all or part of an X chromosome is absent
*
X0 sex-determination system
The XO sex-determination system (sometimes referred to as X0 sex-determination system) is a system that some species of insects, arachnids, and mammals (not including humans) use to determine the sex of offspring. In this system, there is only o ...
, as found in some insects
Vehicles
* X0, a smaller rigged version of an
X1 (dinghy)
* X0, running number for
N700 Series Shinkansen prototype from 2014 to 2021
See also
*
XO (disambiguation)
*
X00, a popular DOS-based FOSSIL driver which was commonly used in the mid 1980s to the late 1990s
*
0X (disambiguation)
{{Letter-Number Combination Disambiguation