"Like other engineering students in Canada who are close to graduating from university, I participated in a ceremony called The Ritual of the Calling of the Engineer, a peculiar and somewhat secretive tradition (developed by the British writer Rudyard Kipling, no less) which culminates with each student receiving an iron ring.P.S. See "Quebec Bridge" at Wikipedia.
"Legend has it that each ring is made from the iron of a bridge that collapsed (twice) into Quebec’s St. Lawrence River in the early 20th century. The disasters were blamed on a combination of negligence, structural deficiencies, and faulty calculations. In all, almost 90 people were killed.
"The ring is therefore meant to be worn as a reminder of our professional commitment to public safety and to maintaining the highest standards of ethics."