I think those indicate how far off that guess was. I have a dartboard when I guessed the year exactly right, numbers 1 and 3 matching these years off, and a blind man for >10 years off or around there.

Yes, I confirmed it with the results from other friends. Very unintuitive, though. Just saying "Accuracy:" before the emojis, would give a good enough hint of what those mean.

Using the blind man with probing cane emoji to signify losing in a game is really disappointing