Recently this empty connector-looking thing started popping up a lot at random times while I’m working. I haven’t been able to reproduce the steps to get it to show up consistently (i.e. I don’t know exactly what I’m doing to get it) and I haven’t seen it mentioned anywhere in official/unofficial Dynamo feature descriptions (if it’s there somewhere, please point me to it).
What exactly is this thing? And what are the steps to create one? So that I can create it when I need it and avoid creating any more by mistake.