CDC aka Dog Collar

Hermes is pretty open about the history:

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The Clou de Forge collection is modeled after farrier’s nails that are used to attach a horseshoe to a horse’s hoof. These are exactly the same nails that go in my horse’s hoof.

Chain d’Ancre literally means anchor chain. And it looks like it.

There are also a lot of equestrian pieces such as stirrup-shaped objects. Mors as in the Mors scarf ring means a horse bit — and it is shaped like one. I think it’s all fun.
Thank you. After another person mentioned it being on the site, I went and tried to look for it yesterday. I couldn't find it.