Can we call it a D2? I'd call it a non-monetary-gaming-fair-coin, but it's hard to reduce it to a 4 letter word like "coin" or "dice" that most people would understand.

Yes, but I'd prefer some more specificity to the shape. D2 can be coin shaped, but don't have to be. There are some diverse shapes in the image of the article.

IIUC "chip" is just a token that represent money, they are not necessary "fair", they are not good to be tossed.

I imagine a parallel world where chips are shaped like empty cones, so they can pilled but they are very bad as a D2. (Perhaps a world where chips are shaped like cubes is more realistic, also bad as D2.)

That's gonna trigger some gambling addicts.