On cheques, you write the dollar part of the amount in words, with no margin to add anything on the left, and then immediately followed by a long horizontal dash to strike out anything that may be appended.
In Japanese and Chinese, there are alternate numerals used on bank notes that have more strokes and therefore can't be amended. The normal number 1 is 一 and the fancy bank version is 壹.
壹 looks kind of like a drone landing on a flower pot.