someone who has synesthesia. Synesthesia is a neurological condition when your brain routes sensory information through multiple unrelated senses, causing you to experience more than one sense simultaneously. Some examples include tasting words or linking colors to numbers and letters.
They often (though not always) consider synesthesia to be a gift, allowing them to see the world through an integration of multiple senses that is truly unique. It is estimated that approximately 3 to 5 percent of the population has some form of synesthesia and that women are more likely to become synesthetes than men.