noun
ninja rope with grappling hook
A rope with a grappling hook used by ninja for climbing walls, scaling obstacles, or securing lines.
忍者はかぎ縄を使って城の石垣を登った。
The ninja climbed the castle's stone wall using a grappling rope.
Compound of かぎ (hook) and なわ (rope). The exact historical origin is uncertain, but the term is associated with ninja tools.