Can I change the ordering symbols?

Answer 1

Yes, the <ol> tag has a type attribute.
It supports the following values:
1 - Default. Decimal numbers (1, 2, 3, 4)
a - Alphabetically ordered list, lowercase (a, b, c, d)
A - Alphabetically ordered list, uppercase (A, B, C, D)
i - Roman numbers, lowercase (i, ii, iii, iv)
I - Roman numbers, uppercase (I, II, III, IV)

For example:
<ol type="A"> ...

Answer 2

and if you want to add your own list graphics, just do it in CSS as background and give a list-type:none;

Answer 3

thanks really helped