why is the devil depicted as having 7 heads (the dragon in revelation)?

REV. 3:Then another sign appeared in heaven: an enormous red dragon with seven heads and ten horns and seven crowns on his heads

Rev. 9The great dragon was hurled down—that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.

do all these heads symbolize something?
(i know i shouldn't be reading ahead so as to get a better understanding.. but i was just curious)
oops sorry that is in chapter 12
 
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