What type of knot is typically used by riggers to connect the ends of two ropes of the same diameter?

The square knot is typically used by riggers to connect the ends of two ropes of the same diameter because it is specifically designed to join two ropes securely. This knot creates a reliable connection that is relatively easy to untie after load has been applied, making it practical for various rigging applications. Its symmetrical structure allows for even distribution of tension across both lines, ensuring that neither side slips or loosens under load.

While the bowline creates a fixed loop at the end of a rope, it does not connect two ropes together effectively. The clove hitch is more suitable for securing a rope to a post or similar object rather than joining two ropes, and the figure-eight knot is primarily used for creating a secure loop, not for connecting lines. Therefore, the square knot is the optimal choice for this purpose in rigging.