X
Spellings
Capital	X
Bas-de-casse	x
Use
Alphabets	Latin
Order	24 th
Phonemes main	/ Ks /, / gz / ...

X (iks) is the ^24thletter and the ^19thconsonant in the Latin alphabet today.

Origin

Hieroglyph Egyptian column	samech Phoenician	xi Greek	Chi Greek	X late Etruscan	X Roman
Likely evolution of the grapheme

Linguistics

Phonetics

• X can be pronounced Mathematics

  The letter x plays in mathematical role privileged but not exclusive. Since Descartes , it is used Traditional, including school and university context, to denote:

  • The real unknown in an equation (eg in the following problem:
    "Solve the equation x ² = - 25 x the unknown. ")
  • a variable in the actual calculations, identities ... (Eg in the following statements:
    "For every number on x, we have: x (x + 1) - 4 x = x ² + x - 4 x = x ^{2 to} 3 x. "Or
    "The function f which, at any Combines is continuous. ")
  • an indeterminate of the polynomial formal (eg in the following statement:
    "The polynomial X ² + 1 is irreducible over the body of real numbers. ")

  For reasons of semantics , the rule requires the use of typography in this context the letter x in italics. This identifies the role played by mathematics that letter and also to avoid confusion with the multiplication symbol . The italic is done in automated language LaTeX when we respect the use of the symbol: this is particularly the case when using the tag \ <math\> \ </ math \> for editing in LaTeX formula in an article in (the are then not required). It is the same in the equation editor (eg OpenOffice.org Math ).

  Coding

  Computer

  • Code ASCII , ISO 8859-1 , Unicode :
    • Capital: 88 U = 0058
    • Minuscule: U 120 = 0078

  Radio

  Audio file
  X Morse Problems listening to the file?

  • Spelling alphabet radio
    • International: X-ray
    • German : Xanthippe
  • In Morse code , the letter X is " -- "

  Other

  Signaling		Sign language		Writing Braille
  Flag	Semaphore	French	Quebec

  See also

  • Latin alphabet
  • ( chi ), letter of the Greek alphabet
  • ( kha ) letter of the Cyrillic alphabet

  Latin alphabet
  A B C D E F G H I J K L M N O P Q R S T U V W x Y Z
  Additional letters	d ( ) /
  With diacritical	superscript: N hook or crook: ( ) H ( ) registered: DJ ( ) pm T Z
  Digraphs	C. Dx Gb Kp LI Mb Mp Nd Ng Nh Nk Ns Nt Ny Nz Or Sh Th
  Trigrams	C'h Ngb NKP Sch Tsh
  Obsolete letters	s

  • Portal of writing

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