Terms

Sesha

sesha
 
Vishnu seated on the coils of Shesha, with seven heads of Shesha forming a canopy
 
 
It is obvious that of the seven basic gods only Vishnu and Shiva are associated with snakes. Vishnu has five or seven headed Shesha. Shiva has a single headed cobra around his neck or upper arms. 
http://wiki.answers.com/Q/In_Hindu_mythology_what_is_snake_symbolic_of
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