Tactics plus/minus number that appears after u solved an exercise

What is the number that appears after I solve a tactics problem, not the rating but the one that appears on top right and have two arroz, up and down, thank you very much

You can evaluate the puzzle to note how good you feel it is (in whatever sense you want to think about it). I'm not sure if there is any effect to it... it may be that puzzles that get consistently downvoted are flagged for evaluation or something. Occasionally there will be a puzzle with a solution that is super obscure because there's some winning line six or eight moves down the engine wants to avoid, and VERY rarely there will be apparently an outright error.

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