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The fifi hook is a small question mark shaped piece of equipment used principally in aid climbing to quickly connect a climber to gear to take their weight. It can also be useful for free climbing, alpinism and mixed climbing.
Typically made of stamped steel or forged alloy, it has a large hole at the bottom for connecting to one's harness and a smaller hole at the top for attaching a retrieval cord in case of a fall.
Due to its open shape it offers very little strength and requires a great deal of caution when used.
References
Fifi hook Wikipedia(Text) CC BY-SA