ul.a {
list-style-type: circle;
}
ul.b {
list-style-type: square;
}
ol.c {
list-style-type: upper-roman;
}
ol.d {
list-style-type: lower-alpha;
}
The list-style-type property specifies the type of list item marker.
Some of the values are for unordered lists, and some for ordered lists.