Synesthesia is when two senses combine with each other and form relationships. For example, I have the most common kind: grapheme-color synesthesia. Mine looks like this. The only one that’s supposed to be black is “1”. Otherwise, the ones in black have no color associated with them.
Numbers and vowels have colors for me. 1 white-ish, 2 red, 3 yellow, 4 green, 5 brown, 6 dark red, 7 blue, 8 gold-white, 9 dark green, 0 black, A green, E orange, I white, O black, U brown, Y turquoise. Some consonants “feel” like they have color, but far less pronounced.
Also sounds have colors and shapes but that may just be association.
Oh I don’t know whether it counts as neurodivergent in the commonly understood way, but I wasn’t sure where else to post it. I’m new, so I don’t know all the communities on here yet.
I find it interesting how only vowels and numbers stick out to you! I hadn’t heard of that before.