Charlotte Crimps
Often called Carlott or Carlotta crimps, these little gadgets hide crimps and knots inside, and are generally used as part of a closure - attach them from your jewellery piece to the clasp; think of a strand of pearls where you need to keep the knot inside something that looks pretty. That's where a Charlotte crimp comes into play.
If you haven't tried these little goofy looking things, give them a go! You will be quite pleased you did!