Ardillon or deployant? What? Here are the different ways a strap can be fastened and what to look for when watch shopping.

The wonderful world of watch straps — leather, rubber, NATO or otherwise — is endlessly varied. Though many types defy classification, it’s helpful to know some common terms and varieties related to that essential part of any band, bracelet or strap: its buckle or clasp — in other words, the hardware that helps you actually affix a watch to your wrist.
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https://www.gearpatrol.com/watches/a33659688/watch-strap-buckles-clasps-guide/