Each item in an ordered list is indented, just as they are with unordered lists. Also, each list item in an ordered list is preceded with a number, in order, instead of a "bullet".
For example, the following HTML source code:
Here is a list of Mexican cities. <OL> <LI>Mexico City <LI>Guadalajara <LI>Monterrey <LI>Acapulco <LI>Tasco </OL>