Originally Posted by xfimpg
Ahhhh thats what they're called.
What they're called varies from place to place. In the us, they're mostly "cotter pins" or "cotter keys". In the UK, it's a "split pin". I don't know what candian usage is. In french, I believe it's une goupille fendu.
In non-bike applications, I have replaced them with paper clips, bent nails, safety pins, twist ties, dental floss, and human hair, plus boring hardware like hitch pin clips, lynchpins, and the like. It depends what sort of loads they're exposed to, and how much force. On the side of a road or trail, I might consider something like that, but not otherwise.