A more thorough explanation:

Signatorius anulus is a Latin term used in Roman law to refer to a signet ring.

During the Roman Empire, signet rings were used as a way to seal important documents. The ring would have a unique design or symbol that would leave an impression on wax or clay, indicating that the document was authentic and had not been tampered with.

For example, a wealthy merchant might use a signet ring to seal a contract for a business deal. The ring would be pressed into wax on the document, leaving a clear impression of the merchant's symbol. This would serve as a legal and binding agreement between the parties involved.

Another example would be a government official using a signet ring to seal a decree or proclamation. The ring would be pressed into the wax, indicating that the document had been authorized by the official and was therefore legitimate.

The term signatorius anulus refers specifically to the signet ring used in Roman law. The examples provided illustrate how the ring was used to authenticate important documents and agreements. The unique design or symbol on the ring would leave a clear impression on wax or clay, indicating that the document had not been tampered with and was therefore legitimate.