"Ayin - לב(Lev) - IR"

http://en.wikipedia.org/wiki/Ayin

http://commons.wikimedia.org/wiki/Category:Eye_(ir_hieroglyph)

http://www.ancient-hebrew.org/emagazine/009.html

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http://www.hebrew4christians.com/Grammar/Unit_One/Aleph-Bet/Ayin/ayin.html

http://gnosticteachings.org/courses/alphabet-of-kabbalah/749-ayin.html

http://en.wikipedia.org/wiki/Apple_of_my_eye

http://www.wikipaintings.org/en/leonardo-da-vinci/heart-and-its-blood-vessels

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http://www.traditioninaction.org/religious/n002rpLapide_Appearance.htm
http://www.medpagetoday.com/Cardiology/Prevention/26071