In Google Search you can trigger the Google Translation widget. But now, Google is testing a G icon to let you "search for this on Google" from that translate widget in Google Search.
I mean, you are already searching for it in Google Search but for the translation. Google is saying, now let me search that translated word for you in Google Search. It seems a bit circular, but it is not a complete circle, I guess.
This was spotted by Khushal Bherwani on Twitter and I cannot replicate, I've been trying for a week or so, but anyway, here is his screenshot:
I am not sure if I am a fan of this button...
Forum discussion at Twitter.
