stationary restraints: When a character's limbs or body is held in place by objects or devices that are made of rigid materials and locked into position such that they will not budge or sway if the victim struggles.

Key examples are pillories or stocks mounted in place, shackles bolted or screwed to a surface, (such as a wall, floor, or table) cuffs holding the subject inside a sex machine, and pipe arrangements built around the subject.