Uncommon
Yosemite Decimal System
American grading system for rock climbs
Yosemite Decimal System
The Yosemite Decimal System (YDS) is a five-part grading system used for rating the difficulty of rock climbing routes in the United States and Canada. It was first devised by members of the Sierra Club in Southern California in the 1950s as a refinement of earlier systems from the 1930s, and quickly spread throughout North America.
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