Yn (majuscule: ?, minuscule: ?) is an archaic Cyrillic letter that was used in the Romanian Cyrillic alphabet which represented the sound of [?n] or [?m].
http://en.wikipedia.org/wiki/Yn

Yn Chruinnaght is a cultural festival in the Isle of Man which celebrates Manx music, Manx language and culture, and links with other Celtic cultures.
http://en.wikipedia.org/wiki/Yn_Chruinnaght

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http://acronyms.thefreedictionary.com/YN

Annual festival of Manx music and dance; includes program, information about artists, ticketing and accommodation, and a history.
http://ynchruinnaght.com/

Enlisted Rating (job) descriptions and qualification factors for the United States Navy. On this page, all about Yeoman (YN).
http://usmilitary.about.com/od/enlistedjob1/a/yn.htm