X

X is the 21st letter of the classical and the 24th letter of the modern Latin alphabet. It describes the combination of the two consonants [k] and [s], i.e. [ks]. The Romans adopted the alphabet from the Greeks in its Western Greek form. There the letter X had the sound value [ks], in contrast to Eastern Greek, where it was [kʰ].

Ancestors and siblings in other alphabets

• Χ χ : Greek letter Chi, from which the following derive:
  • Ꭓ ꭓ : Latin chi
  • Х х : Cyrillic letter Kha
  • Ⲭ ⲭ : Coptic letter Khe, which derives from Greek Chi
  • 𐍇 : Gothic letter enguz, which derives from Greek Chi
  • 𐌗 : Old Italic X, which derives from Greek Chi, and is the ancestor of modern Latin X
    • ᚷ : Runic letter Gyfu, which may derive from old Italic X
• Ξ ξ : Greek letter Xi, which was used in place of Chi in the Eastern (and the modern) Greek alphabets

Other uses

X may also refer to:

• X chromosome
• X-rated industry
• X (social network)