It's found on Tiny Pop's Facebook page, alongside the shorter lowercase a that was first sourced through some timer thing. I delayed sharing it because around that same time I found the regular-sized numbers 4 and 5 first on a Dino Days promotional video, albeit in bold, and because of an exam-taking break. I've now replaced the image you see here. Credits to all people and business involved, including @UandEcarl1 who has found regular-sized numbers 0, 3, 5 and 7 listed on its airing channels. Although we still haven't found an un-bolded regular-sized 4...