What is the name of the guy wire that runs from one side of a crossarm to the next pole?

The guy wire that runs from one side of a crossarm to the next pole is referred to as an "Arm guy." This term directly relates to its function of providing support and stability to the crossarm, which is essential to maintain the structural integrity of the pole and the equipment it carries. The Arm guy is strategically placed to counteract lateral forces that may cause leaning or swaying, ensuring that the crossarm remains level and correctly positioned.

The other terms do not accurately describe the specific function or placement of the guy wire in question. The term “Crossarm guy” could suggest a connection that is more directly attached to the crossarm itself rather than spanning between two points. "Support wire" is a more general term that doesn’t specifically refer to the arrangement in question, while “Connection wire” lacks the specificity needed to identify the unique role of the guy wire between the crossarm and the pole. Thus, "Arm guy" is the correct terminology that specifies its role and placement within the structure.