Greek alphabet  



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Xi (uppercase Ξ, lowercase ξ; Greek: ξι) is the 14th letter of the Greek alphabet. It is pronounced [ksi] in Modern Greek, and generally /zaɪ/ or /saɪ/ in English.^{[1]} In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh .
Xi is distinct from the letter chi, which gave its form to the Latin letter X.
Both in classical Ancient Greek and in Modern Greek, the letter Ξ represents the sound [ks]. In some archaic local variants of the Greek alphabet, this letter was missing. Instead, especially in the dialects of most of the Greek mainland and Euboea, the sound [ks] was represented by Χ (which in classical Greek is chi, used for /kʰ/). Because this variant of the Greek alphabet was used in Italy, the Latin alphabet borrowed Χ rather than Ξ as the Latin letter X.
While having no Latin derivative, the Xi was adopted into the early Cyrillic alphabet, as the letter ksi (Ѯ, ѯ).
The uppercase letter Ξ is used as symbol for:
The lowercase letter ξ is used as a symbol for:
Character  Ξ  ξ  Ⲝ  ⲝ  

Unicode name  GREEK CAPITAL LETTER XI  GREEK LOWERCASE LETTER XI  COPTIC CAPITAL LETTER KSI  COPTIC LOWERCASE LETTER KSI  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  926  U+039E  958  U+03BE  11420  U+2C9C  11421  U+2C9D 
UTF8  206 158  CE 9E  206 190  CE BE  226 178 156  E2 B2 9C  226 178 157  E2 B2 9D 
Numeric character reference  Ξ  Ξ  ξ  ξ  Ⲝ  Ⲝ  ⲝ  ⲝ 
Named character reference  Ξ  ξ  
DOS Greek  141  8D  165  A5  
DOS Greek2  189  BD  232  E8  
Windows 1253  206  CE  238  EE  
TeX  \Xi  \xi 
^{[6]}
Character  𝚵  𝛏  𝛯  𝜉  𝜩  𝝃  

Unicode name  MATHEMATICAL BOLD CAPITAL XI 
MATHEMATICAL BOLD LOWERCASE XI 
MATHEMATICAL ITALIC CAPITAL XI 
MATHEMATICAL ITALIC LOWERCASE XI 
MATHEMATICAL BOLD ITALIC CAPITAL XI 
MATHEMATICAL BOLD ITALIC LOWERCASE XI  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  120501  U+1D6B5  120527  U+1D6CF  120559  U+1D6EF  120585  U+1D709  120617  U+1D729  120643  U+1D743 
UTF8  240 157 154 181  F0 9D 9A B5  240 157 155 143  F0 9D 9B 8F  240 157 155 175  F0 9D 9B AF  240 157 156 137  F0 9D 9C 89  240 157 156 169  F0 9D 9C A9  240 157 157 131  F0 9D 9D 83 
UTF16  55349 57013  D835 DEB5  55349 57039  D835 DECF  55349 57071  D835 DEEF  55349 57097  D835 DF09  55349 57129  D835 DF29  55349 57155  D835 DF43 
Numeric character reference  𝚵  𝚵  𝛏  𝛏  𝛯  𝛯  𝜉  𝜉  𝜩  𝜩  𝝃  𝝃 
Character  𝝣  𝝽  𝞝  𝞷  

Unicode name  MATHEMATICAL SANSSERIF BOLD CAPITAL XI 
MATHEMATICAL SANSSERIF BOLD LOWERCASE XI 
MATHEMATICAL SANSSERIF BOLD ITALIC CAPITAL XI 
MATHEMATICAL SANSSERIF BOLD ITALIC LOWERCASE XI  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  120675  U+1D763  120701  U+1D77D  120733  U+1D79D  120759  U+1D7B7 
UTF8  240 157 157 163  F0 9D 9D A3  240 157 157 189  F0 9D 9D BD  240 157 158 157  F0 9D 9E 9D  240 157 158 183  F0 9D 9E B7 
UTF16  55349 57187  D835 DF63  55349 57213  D835 DF7D  55349 57245  D835 DF9D  55349 57271  D835 DFB7 
Numeric character reference  𝝣  𝝣  𝝽  𝝽  𝞝  𝞝  𝞷  𝞷 
These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.
Uppercase Ξ is used as an 'E' to stylise company names/logos like Razer (styled as RΛZΞR) and musicman Banners (styled as BANNΞRS). (Compare: Heavy Metal umlaut; Faux Cyrillic)
Look up Ξ or ξ in Wiktionary, the free dictionary. 