Yeah that's technically true of course. But it's a well known fact that Norwegians can't spell, just as the danish can't speak properly and the finns can't go outside without a knife.
Just hopping in to say that with the help of AI, I finally managed to figure out that the button shows the absolute difference between two numbers. The order of operations is 50 - 75 MU = 25.
Why it's marked MU is a mystery.
edit: actually, might be "marginalutfall" or "marginalutveckling".
Same for me with Sync. But I had boost for Reddit too, and now I'm on boost for Lemmy.