In the designation "CO" for a chain sling, what does the "C" refer to?

In the designation "CO" for a chain sling, the "C" refers to Choker configuration. This configuration indicates how the sling is arranged and utilized when lifting loads. When a sling is in a choker configuration, it wraps around the load and then back through itself, creating a secure grip. This configuration is particularly useful for securing loads that may shift or move during lifting, and it helps provide a stable hold.

Understanding the significance of different configurations is crucial for safe lifting operations, as they directly affect how the sling interacts with the load and the overall stability during the lift. Other options in the question pertain to different aspects of rigging or lifting but do not specifically identify the configuration style that the "C" signifies in this context.