A topo is a diagram or annotated photo that maps out a climbing route, showing its line, pitches, belay stations, protection, and grade. Found in guidebooks and apps, topos help climbers find and follow routes on the rock. It should not be confused with a topographic map used for navigation.
A boulder problem is a single bouldering route — a short sequence of moves on a boulder or wall, climbed without a rope. The name reflects bouldering's puzzle-like nature: each problem has a defined start and finish and is 'solved' by working out the right sequence. Problems are graded on the V-scale or Font scale.
An offwidth is a crack too wide to hand-jam but too narrow to fit your whole body, making it one of the most awkward and strenuous features to climb. Offwidth technique uses arm bars, chicken-wings, and stacked hands and feet wedged inside the crack, and it is notorious for being physical and hard to protect.
A chimney is a crack or gap in the rock wide enough to fit your whole body inside. Climbers ascend it by pressing against the opposing walls with their back, feet, hands, and knees — a technique called chimneying — rather than gripping holds. Chimneys are awkward and strenuous but can offer secure, restful positions.
An overhang is rock that is steeper than vertical, leaning out over the climber so gravity pulls you away from the wall. Overhanging climbing is strenuous and powerful, demanding good body tension and footwork to keep weight on the feet. The steepest overhangs, which go horizontal, become roofs.
A roof is a section of rock that juts out horizontally, overhanging so severely that it runs parallel to the ground like a ceiling. Climbing a roof demands powerful, tension-heavy movement — heel and toe hooks, underclings, and core strength — to keep the body from swinging off, and pulling the lip is often the crux.
A dihedral is an inside corner where two rock faces meet at an angle, like the open pages of a book — also called a corner or open book. Climbers ascend dihedrals using opposing pressure between the two walls, with techniques such as stemming, laybacking, and jamming any crack in the corner.
An arete is a narrow, outward-facing edge or ridge of rock where two faces meet, often formed by glacial erosion. In climbing, aretes offer distinctive, frequently photogenic lines that require balance and techniques like laybacking and flagging to climb the edge itself rather than a face or crack.
A pitch is a section of a climb between two belay points, no longer than a single rope length. Routes longer than one rope length are split into multiple pitches that the climbing team ascends one at a time. A single-pitch route is climbed in one go; multi-pitch routes link several pitches up a wall.