x The X-Files X-Men The Last Stand X Window System X Window System protocols and architecture X Window core protocol
x11 X Window System
xanadu Xanadu House
xenon Xenon
xenoplanet Extrasolar planet
xi 11th century
xii 12th century Pope Pius XII
xiii 13th century
xiv 14th century Louis XIV of France
xix 19th century
xl Super Bowl XL
xmas Christmas Island
xo The Children's Machine
xp Windows XP
xv 15th century Rococo
xvi 16th century Neoclassicism Pope Benedict XVI
xvii 17th century
xviii 18th century
xx 20th century