Could you explain what the “SEAL” reference in certain signature block means?

"seal" statutes

GoDocs understands some states have "seal" statutes pursuant to which certain documents are to be signed "under seal". The concept of "sealing" or signing a document "under seal" (by applying a physical seal or embossing) is archaic and no longer a part of the law of most states. However, there are still states where it has some possible significance under contract law. For those states it is sufficient to place the word "seal" in parentheses next to the signature. We automatically insert the "Seal" language for these states. You do not need to get an actual corporate seal on the documents - the only thing necessary is the word "(SEAL") as it appears in the document signature blocks.