What are pulleys in a block referred to as?

The term for pulleys in a block is "sheaves." Sheaves are the grooved wheels that play a critical role in pulley systems by allowing rope or cable to run smoothly while redirecting force. In lifting operations, sheaves facilitate the movement and control of heavy loads by creating a mechanical advantage, which can greatly reduce the effort needed to lift those loads.

Understanding the correct terminology is important in rigging and millwright practices because using the proper names helps ensure clear communication among team members and enhances safety in operations. The other terms listed, while they may relate to rigging and lifting, do not specifically refer to the pulley wheels themselves. Shackles are hardware used to connect components, dang refers to improper positioning or attachment of equipment, and pulley wheels is a more generic term that does not specifically capture the technical definition used in industry.