pulley

This term describes a mechanical device designed to reduce the effort required to lift heavy objects by distributing weight or altering the angle of pull. It evokes a sense of industrial utility and mechanical advantage, typically associated with construction sites, sailing rigs, or gym equipment.

As a standard countable noun, it follows regular English pluralization rules. It is used concretely to refer to the physical hardware and technically to describe the system of sheaves and ropes used in physics and engineering.