Google is testing showing colorful dots, a blue, red, yellow and green set of dots, to help users understand different search result elements. When you click on the dots, it launched an "about this result" box to help you understand what that search feature does.
Valentin Pletzer posted this on Twitter and showed how this works, here is his screen shot:
As you can see, it launches this "learn how search works" box where you can learn more.
I have not seen this myself.
Forum discussion at Twitter.
Note: This story was pre-written before the Rosh Hashanah holiday. I am currently offline for the holiday and unable to respond to comments on this site, social, media or other platforms.