list-style-type

These are html tags you type.

    <ul>
      <li>default (disc)</li>
      <li style="list-style-type: none;">none</li>
      <li style="list-style-type: disc;">disc</li>
      <li style="list-style-type: circle;">circle</li>
      <li style="list-style-type: square;">square</li>
      <li style="list-style-type: decimal;">decimal</li>
      <li style="list-style-type: decimal-leading-zero;">decimal-leading-zero</li>
      <li style="list-style-type: lower-roman;">lower-roman</li>
      <li style="list-style-type: upper-roman;">upper-roman</li>
      <li style="list-style-type: lower-alpha;">lower-alpha</li>
      <li style="list-style-type: upper-alpha;">upper-alpha</li>
      <li style="list-style-type: lower-greek;">lower-greek</li>
    </ul>

Usually, you should put the list-style-type style property on the ul or ol element.
I have put them on the li elements, making every li element diferent, as a sample.

Other values for the list-style-type are:
lower-latin upper-latin hebrew armenian georgian cjk-ideographic hiragana katakana hiragana-iroha katakana-iroha