In Norse mythology, Thor is a hammer-wielding god associated with thunder, lightning, storms, oak trees, strength, the protection of mankind, and also hallowing, healing and fertility. And also the origin of the weekday name Thursday. But Thorium, is a silvery-white metal, naturally occurring radioactive, chemical element with the symbol Th and atomic number 90.
So, combining this two, this cute design present a silvery-white metal chemical element that holding a hammer. A whole new geeky level combination of avengers, mythology and chemistry.