X-1
X.10
X.12
X/1999
X-24
X.25
X.400
X-4 missile
X.500
X.509
X (band)
X-band radar
X-bar theory
X-Clan
X-COM
X-Day
X-dimension of recorded spot
X-efficiency
X-Factor
X Games
X-inefficiency
X Japan
X-kan
X-Men
X-Men (animated series)
X-Men: Evolution
X-Men (movie)
X!NK
X-No-Archive
X-plane
X-Plane
X-Play
X-Prize
X PRIZE
X-rated
X-ray
X-ray astronomy
X-ray binaries
X-ray burster
X-ray crystallography
X-ray fluorescence
X-ray machine
X-ray photoelectron spectroscopy
X-Ray Spex
X-Troll
X Window System
X-wing
X-wing computer game series


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