X is the twenty-fourth letter in the modern Latin alphabet. Its name in English is spelled ex (pronounced /ɛks/),[1] plural exes (pronounced /ɛksəz/). Straight off wiki. http://en.wikipedia.org/wiki/X
MDMA (3,4-methylenedioxy-N-methylamphetamine), most commonly known today by the street name Ecstasy (often abbreviated E, X, or XTC), is a semisynthetic member of the amphetamine class [2] of psychoactive drugs, a subclass of the phenethylamines.[3] MDMA also falls under many other broad categories of substances, including stimulants, psychedelics, and the empathogenic-entactogens.