What does "sphragistics" mean?

The study of seals, especially those attached to documents

What is a synonym for "sphragistics"?

Common synonyms include: armory, badge, baton, button, chain, collar.

Pronounced //sfrəˈd͡ʒɪstɪks//.

/sfrəˈd͡ʒɪstɪks/ noun

noun ·Rare ·Advanced level

Noun

From Ancient Greek σφραγίς (sphragís, “seal”).