Labyrinth Seal: A non-contact seal design that utilises a series of interlocking grooves or teeth to create a tortuous path, thereby reducing leakage flow without significant increases in friction.

The first record of the ring’s use was on two letters of Clement IV in 1265 and 1266. It was used as a wax seal in private letters in place of the official lead seal used for solemn papal documents.

A new ring is cast in gold for each pontiff. It has a relief of St Peter - revered as the first pope and said to have been a fisherman. The pope's name is written in Latin on the ring. Historically, ...

A rescue mission on the coast of the United Kingdom has ended a six-year ordeal for a seal entangled in a plastic ring. The seal, named Commuter, was first spotted in September 2017 in Cornwall ...