I do not know the name but it is often used to connect small solar panels to a battery (To maintain them)
There is a matching unit with Crocodile clips.
The clips are Red and Black the idea being to make sure it is connected with the correct polarity
I've been a member on here since 2004 & have nearly always found somebody willing to offer info or advice. Let's face it nobody knows everything (although some might think they do) but between us all we pretty much cover most things. Thanks again Alf & everybody else who replied.