Как по Английски будет некто таинственный

noun

The twenty-fourth letter of the alphabet.

Примеры использования:

X is the 24th letter of the alphabet and it's got me stumped.

A rating assigned to films classified as suitable for adults only (replaced in the uk in 1983 by 18, and in the us in 1990 by nc–17).

abbreviation

The drug ecstasy.

Примеры использования:

Many of the users reported that, since "x" only lasts 4 to 5 hours, it brought them the feeling the…