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The symbols of Aaseevaham are Elephant & Lotus. A fascinating descriptions on these shall be found in this video.
Saptha Kanya worship was followed in Indus Civilization which was the Ancient Tamils' settlement through the sea route. Shiva is the First Theerthangarar of Tamil Samanam. All the Gods of "so called" Hinduism are actually the extraordinary Aaseevaha Siddhars or Symbolic Deities of Aaseevaham, i.e., Tamil Samanam.
A complete analysis on Shiva is available in the Video.