پلکان
type: Concept
preferred label: stairs @en
related: نردبان

نردبان
type: Concept
broader: تجهیزات کمکی
preferred label: ladders @en
related: کوه‌نوردی
related: پلکان

تجهیزات کمکی
type: Concept
narrower: نردبان
preferred label: ancillary equipment @en

کوه‌نوردی
type: Concept
preferred label: climbing @en
related: نردبان