Even though some of the presentations of both nobles and gods are the same they are depicted differently as each symbol required certain elements to be representative.
If it is the symbol of a god it will have no border around it. This shows respect for the gods as it is said there power has no limitations.
If it is a symbol that represents a noble house hold it will be in cased in the symbol of a shield for they are the rulers who run and look after the people they are charged with.
If the symbol represents a religious institute it will be represented in a plain circle with the symbol of the god and a small printed number at the bottom representing the location.
the symbols of any military might are presented as a pair of crossed blades crowning the symbol that represents the group they come from unless they are protectors of a noble house in which case they bare the nobles mark.