1. 
   XO
   symbol for the karyotype in which there is only one sex chromosome, an X chromosome, the other X or Y being absent; it is observed in most cases of Turner syndrome.
   Found op http://www.encyclo.co.uk/local/21001
   
   
2. 
   XO
   [album] XO is the name of the fourth album recorded by American singer-songwriter Elliott Smith. Smith`s first work on a major label, it was released by DreamWorks Records on August 25, 1998. Bong Load Custom Records released it on vinyl LP, which has since gone out of print. Vinyl copies of...
   Found op http://en.wikipedia.org/wiki/XO_(album)
   
   
3. 
   Xo
   XO is an abbreviation for Executive Officer
   Found op http://www.probertencyclopaedia.com/N24.HTM
   
   
4. 
   XO
   [Leathermouth album] XO (often typeset as XØ) is the debut album released by Leathermouth, My Chemical Romance`s rhythm guitarist Frank Iero`s post-hardcore side project. The album was released through Epitaph Records on January 27, 2009. Although the album did not chart on the Billboard 20...
   Found op http://en.wikipedia.org/wiki/XO_(Leathermouth_album)
   
   
5. 
   XO
   Executive Officer
   Found op http://en.wikipedia.org/wiki/List_of_U.S._government_and_military_acronyms
   
   
6. 
   XO
   Abbreviation for "Extra Old" or "Extremly Old" (very old) as an indication of the maturity period for spirits, see below Calvados and cognac .
   Found op http://www.wein-plus.eu/en/XO_3.0.1401.html
   
   

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