Whats a wire loop on a necklace pendant called?

I have made a bunch of pendants for necklaces out of resin. I drilled a hole through them, and now I need a loop so I can run a string through to put it on a necklace. I want one that you just pull apart with pliers and squeeze back together once its in.

I've googled a whole bunch of stuff, and I can't figure out the right thing to search! I've looked on jewelery making sites without much luck.

Jump ring.

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