Derived from the word ‘hex’ which originally held the definition of ‘cast a spell over someone or something; put a hex on someone or something’, it has 6 sides, 6 points, and 6 triangles… 666.
666 in Christianity is defined as the number of the beast.
Where are hexagrams most notably used today? Here is a list…
Stained Glass(es) in Churches & Synagogues
Israeli Flag
http://levinejudaica.com/catalog/images/israel%20flag%20lalalal.jpg
One of Freemasonry’s symbols (semi-hexagram)
http://www.freemasoninformation.com/art/ordo.gif