The number that comes before 10 is 9, which has one digit.
The reference text provided discusses digits and numbers from 0 to 10, emphasizing that there are twelve digits used in total (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10). It also highlights the importance of differentiating between the terms "digit" and "number." While this information is relevant to understanding numerical concepts, it doesn't directly change the answer to the initial question, which specifically asks about the number before 10.
