Engineers in Canada wear "iron" rings that are meant to be representative of this responsibility[0]. While not actually true, most of the time people talk about it they claim the rings were originally made from a failed beam of the first Quebec Bridge[1], improperly engineered.

My wife has three pieces of jewelry- engagement ring, wedding ring, iron ring. She doesn't tell me which one she loves best.

[0]https://en.m.wikipedia.org/wiki/Iron_Ring [1]https://en.m.wikipedia.org/wiki/Quebec_Bridge