Both "grey" and "gray" are correct spellings of the color between black and white; the difference is primarily geographical. "Gray" is the standard spelling in American English, while "Grey" is the preferred spelling in British English, as well as in Canada, Australia, and most other English-speaking nations. A helpful mnemonic is that "A" is for America and "E" is for England. Despite these regional preferences, both spellings are understood globally. There are a few exceptions where only one spelling is used: for example, the dog breed is always a "Greyhound," the unit of absorbed radiation is always a "Gray" (Gy), and proper names like "Earl Grey" tea or the TV show "Grey's Anatomy" maintain their specific official spellings.