What's the difference between sigil and sigillography?

Sigil

Definition:

• (n.) A seal; a signature.

Example Sentences:

• (1) The house, when it’s revealed, is beautiful, made up of four incrementally smaller sections with a shining copper roof, and clad in a harlequin pattern of 1,924 glazed sigils of St Jules.

Sigillography

Definition:

Example Sentences: