I’m not sure as to why it got taken down or if it was in any way violating the Roblox ToS. All assets used in the icon are all able to be purchased/viewed on the Roblox website and the text in the image is not in any way inappropriate.
I guess it just thought that the part in class after “cl” was supposed to be emphasized because the words are big, but they can still be mistaken because of Roblox censorship system.
I had the same problem when I uploaded my version of a Japanese flag. I got a 1 day ban but I just emailed Robloc Support stating my problem and they gave me an apology.
I had this problem too with a similar icon. The roblox algorithm recognizes that the roblox character limbs are showing too much skin. If you contact roblox support, the’ll most likely revoke the take-down. With mine it only took a few days to get the problem solved.