The "Other" tool is a generic drawing tool that can be used to draw any node and connection. When using this tool, you will be prompted to fill in the node type and connection type attributes as you go. Similarly, the "Join" tool can be used to connect any nodes, with you being prompted to fill in the connection type attribute.
These tools can be used to draw in pole-to-pole guy spans or other connection types. However, in those situations, it's often simpler to continue using the aerial drawing tool and update the node type attribute or the connection type attribute afterward. You can access these attributes by clicking on the node or connection line on the map. Another useful situation for the "other" tool is pushbraces.