In American English, this element is called aluminum, while in British English it's more commonly referred to as aluminium. The two names refer to the same chemical element. In scientific writing and academia, both aluminum and aluminium are commonly used and considered correct names. The American Chemical Society (ACS) officially adopted aluminum in 1925, but in 1990 The International Union of Pure and Applied Chemistry (IUPAC) accepted aluminium as the international standard. And so we land today: with aluminum used by the English speakers of North America, and aluminium used everywhere else. Have a nice day 😉