According to the history Salomon's seal was a magic ring which King Salomon possessed ...

Professor Veine said:
« Salomon's seal is the keystone,   The cornerstone of the architecture of the power of Salomon and the world
on which he maintains his power …
Salomon's seal seals and receives all the secrets.
It is the symbol of the one who possesses the world, and all knowledge,

It is the symbol of the "Great Architect."