"The Greeks proposed the existence of five basic elements. Of these, four were the physical elements – fire, air, water and earth – of which the entire world is composed. Alchemists eventually associated four triangular symbols to represent these elements.
The fifth element, which goes by a variety of names, is more rarefied than the four physical elements. Some simply call it Spirit. Others call it Aether or Quintessence (literally "fifth element" in Latin).
In traditional Western occult theory, the elements are hierarchical - spirit, fire, air, water and earth – with the first elements being more spiritual and perfect and the last elements being more material and base. Some modern systems, such as Wicca, view the elements as equal."
What the alchemy symbol air represents in term of the vampire is their evolution from human (the bottom) to something more (the vampire.)
The circle symbol represents the labyrinth, which in turn represent their long lives.