Grigri
A Grigri (or Gri-gri, Gris-gris) is a hand-sized rock-climbing device designed to help secure rock-climbing or rope-acrobatic activities. Its main characteristic is self-camming under a shock load. Belayers using a Gri-Gri need full-attention on their climber and skillful operation to ensure safety. Grigri is a trademark of Petzl, but the success of this tool is so huge that it's likely to become a common name.
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The name of Rumpelstiltskin in French is Grigrigredinmenufretin.
Gris-gris, also spell as grigri, is an African talisman, amulet or incantation made of jewery that protects the wearer from evil.