I perceive numbers and letters as colours, but its odd, I dont really get it with new symbols from maths I see - I percieve them all black like ink, so I must have developed this when I was younger. Its a bit annoying sometimes when you get mixed up between the spellings of words because certain letters have similar colours. In words, each character has it's own colour, but the first letter is dominant and from a distance (in my mind) apears as that colour