list-style

/* type */
list-style: square;

/* image */
list-style: url('../img/shape.png');

/* position */
list-style: inside;

/* type | position */
list-style: georgian inside;

/* type | image | position */
list-style: lower-roman url('../img/shape.png') outside;

/* キーワード値 */
list-style: none;

/* グローバル値 */
list-style: inherit;
list-style: initial;
list-style: unset;

List 1
<ul class="one">
  <li>List Item1</li>
  <li>List Item2</li>
  <li>List Item3</li>
</ul>
List 2
<ul class="two">
  <li>List Item A</li>
  <li>List Item B</li>
  <li>List Item C</li>
</ul>

.one {
  list-style: circle;
}

.two {
  list-style: square inside;
}

ul {
  list-style: none;
}

ul li::before {
  content: "\200B";
}