The most eloquent and efficient way to say it, is not to say it all
What exactly is the point of communicating this information? I suggest you're overcomplicating matters, and certainly don't think using a novel icon is going to add value to the experience.
A great deal of the content we see online is automatically, or algorithmically curated. If it was really necessary to communicate this fact, we'd have seen language and icons emerge as a solution for doing it, but we don't have these.
The time to communicate anything along these lines is when the content is personalized to an individual. In that case, it's appropriate to say something like "Based on your reading history".
Otherwise, I recommend not communicating the point at all.