markers of bullets

There are about a dozen 'list style types.' Here's a fairly comprehensive list:

https://www.w3schools.com/cssref/pr_list-style-type.php

Again, though, not all browsers support all list styles, and EPUB readers are always a subset of browser functionality. If you were to run through the complete list, you would probably find that most readers reduce most of those to dots, blank space or even garbage characters.

There is no specific statement for the list type in your sample CSS code. In addition to list-style-position, there should be a list-style-type command, like these examples:

list-style-type: circle;
list-style-type: square;
list-style-type: disc;

Since 'disc' — the dot — is the default, that's what you will get if otherwise undefined or (usually) with any unsupported option.