A-frame
An A-frame is a item of BDSM/Femdom furniture designed to tie a submissive or slave to. It consists of a large triangular frame about 7 feet tall and 2-3 feet wide. The space inside the triangle is usually filled with a lattice work of rope or horizontal steel bars. A-frames are either secured to a wall or mounted on a sturdy base; as with other types of furniture, it is vital that the base be stable enough to prevent toppling even if the captive submissive struggles violently.
