What do you commonly call pulleys that connect the load to the main lines?

The commonly used term for pulleys that connect the load to the main lines is "trolley" or "carriage." These components are integral to many rigging systems, allowing for the smooth movement of loads by reducing friction and facilitating mechanical advantage. A trolley typically moves on a track and can be used to guide the load along a designated path, making it easier to lift, lower, or reposition the load as needed. This is especially important in technical rescue scenarios, where precise control over the load is crucial for safety and effectiveness.

In contrast, terms like grapples or anchors refer to different components used in rigging and rescue operations, while 'slider' or 'pulley' doesn't accurately capture the specific function of moving a load along a line. Similarly, 'base' or 'capstan' signifies different types of machinery or setups that do not perform the role of connecting a load to main lines in the same way. Understanding these terms helps clarify the functions and applications of various rigging equipment in rescue situations.