A seal or stamp.

In that day, saith the LORD of hosts, will I take thee, O Zerubbabel, my servant, the son of Shealtiel, saith the LORD, and will make thee as a SIGNET: for I have chosen thee, saith the LORD of hosts. ( Haggai 2:23 )

Source: A King James Dictionary. (Used with permission. Copyright © Philip P. Kapusta)

Bibliography Information

"Entry for 'Signet'". A King James Dictionary.