O
- Objective danger
- Danger in a climbing situation which comes from hazards inherent in the location of the climb, not depending on the climber's skill level. Most often these involve falling rock or ice, or avalanches.
- Off belay
- Called by a climber when requesting that the belayer remove belay equipment from the climbing rope (for example, when cleaning top protection from a lead route). Replied to with Belay off.
- Off-width
- A crack that is too wide for effective hand or foot jams, but is not as large as a chimney.
- On belay
- What a climber calls when he is ready to be belayed. Replied to with Belay on.
- On-sight
- A clean ascent, with no prior practice or beta.
- Open book
- An inside angle in the rock. See also dihedral.
- Overhang
- A section of rock or ice that is angled beyond vertical. See roof.
Read more about this topic: Glossary Of Climbing Terms
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