[climbing] A Grigri (or GriGri, Gri-gri or Gris-gris) is an assisted braking belay device manufactured by Petzl designed to help secure rock-climbing, rappelling, and rope-acrobatic activities. Its main characteristic is a clutch that assists in braking under a shock load. The success of this device has led to grigri becoming a common name ... Found on http://en.wikipedia.org/wiki/Grigri_(climbing)