Back in the Medieval times, people didn’t have last names. In England, it was decided that your profession would be your last name; Taylor was a tailor, Smith was a smith, Miller was a miller, Barber was a barber, and so on. Seals – meaning “son of seal”– was of a noble occupation. A man with the last name Seal (soon to be Seals) made wax stamps / seals and signet rings for those of nobility and royalty to certify documents (i.e., letters). Thus, the icon was developed.
To sum up, here's the result: Tré Seals — Designed. Sealed. Delivered.