What is the angle formed between the sling and the vertical line when lifting called?

The angle formed between the sling and the vertical line during lifting is referred to as the sling angle. This angle plays a critical role in rigging operations because it affects the load distribution and the forces acting on the sling. A smaller sling angle (closer to vertical) typically results in less force being applied to the sling, which can enhance safety and reduce the risk of equipment failure. Conversely, larger sling angles can increase the forces on the sling and the attachment points, necessitating careful consideration during rigging to ensure loads are lifted securely and within safe limits. Understanding the concept of sling angles is essential for safe lifting practices and is a fundamental aspect of rigger training.