The symbol, like our illustration style, is inspired by language and typography. It is born from the ellipses: a punctuation mark that represents an unfinished or impending thought, an idea to come, what’s next. This is, again, what happens on Medium — there’s always a new idea, always more to the story.
I really like the new addition to the Medium logo. I love it more now that I realize that it's an ellipses! The 3D component to it adds to the idea that there's more to discover and discuss. Nice work!