![the animated plus/minus icon][1]
[1]: https://i.sstatic.net/oB2fd.gif
So I've seen this animated gif icon on many, many websites.
It seems to always be related to comments or feedback. My questions are:
1. What is the common name for it?
2. Who created it?
I would like to use this image on my own website, but I need to figure out if I can get permission to do so.