the capital I is often written as a single downward stroke, making it look very much like a small L, too-or like the numeral 1, for that matter. For many people in Europe, writing a 1 in this way looks rather like a 7-so they write the number 7 with a line through the middle, like this: 7. Many also cross out the zero in order to differentiate it from a capital o, in this way: 0.