Simul climbing in the context of "Pitch (ascent/descent)"

Big wall climbing is a form of rock climbing that takes place on both very long and very sheer multi-pitch climbing routes – of at least 6–10 pitches or 300–500 metres in length – that typically require a full day, if not several days, to ascend. Big wall routes are sustained and exposed and the climbers typically remain suspended from the continuously sheer and vertical rock face, even hanging from the face when sleeping, with limited options to sit down or escape unless they abseil down the route—which is itself a complex and risky action. It is therefore considered a physically and mentally demanding form of rock climbing.

Big wall climbing is typically done by pairs of climbers using a traditional climbing style, but with the distinction that the non-lead climber usually ascends by jumaring up a fixed rope to save time and energy. It requires an extensive range of supplies and equipment over and above that of traditional-climbing that is carried in haul bags, such as portaledges, aid climbing equipment, poop tubes, and food and water. Big wall climbing also requires additional climbing techniques such as using pendulums/tension traversing, using aid climbing techniques, employing trail ropes, jumaring, and sometimes the technique of simul climbing.