"for example, among the Berbers, it is seen both as a vulviform symbol of
fertility and as a protecting eye."
I guess this passage is referring, inter alia, to the hand of Fatima
(http://www.tumblr.com/tagged/hand%20of%20fatima;
http://perlbal.hi-pi.com/blog-images/238919/gd/1233428225/La-main-de-Fatima.jpg)\
. This symbol can also be found in Kabbalistic ones and is named "Hamsa".
http://www.kabbalah72.net/hamsa_hand_s/34.htm
http://www.kabbalah72.net/Hamsa_Jewelry_s/76.htm
http://www.squidoo.com/kabbalah-symbols
http://www.myjewishlearning.com/beliefs/Issues/Magic_and_the_Supernatural/Practi\
ces_and_Beliefs/Amulets/Hamsa.shtml
http://www.google.com/search?um=1&hl=fr&tbo=d&biw=1680&bih=890&tbm=isch&sa=1&q=r\
ed+string+evil+eye&btnG=
http://www.google.com/search?hl=fr&site=imghp&tbm=isch&source=hp&biw=1680&bih=89\
0&q=kabbalah+red+string+evil+eye
Another kabbalistic amulet which is not a Hamsa:
http://secretamulets.com/evil-eye-protection.html