Here is an "Acrylic Stand".
And...it's pretty much just what it says it is. Flat, colored pieces of thin acrylic hard plastic cut to a shape & set on a base. You would use this to decorate on top of a cabinet or shelf, as it is one-sided.
In 2020, Sega decided to do a mini slogan/branding thing for Sonic (they have in the past) with positioning him as "DJ Popcultcha", and showing him with vibrant colors or doing the record turn-tables. This stand is here to promote that with it's fun vinyl record shaped base. The art has Sonic being a DJ at the turntables in a very "SA1" like style (almost the 'big dumb grin'/bent teeth/curved eye/pupil & odd bending pose) with yellow headphones not quite on his ears. He's labeled with an offset 'banner' at the bottom. The effect of the acrylic is actually pretty interesting, because it looks a little like a graphic from a website or a .jpg or something 'made real' like something pulled from the screen & set in a room. The SegaShop (Japan Only) posted about it, so it is likely some kind of exclusive.