The list-style-image CSS property is used to set a custom image as the marker or bullet for list items. Instead of using the default bullet points or numbers, you can use an image of your choice to style the markers.

The list-style-image property accepts a URL value that specifies the path to the image file to be used as the list marker. The image can be in various formats, such as PNG, JPEG, or GIF.

Here’s an example:

ul {
  list-style-image: url("path/to/image.png");

In this example, the list-style-image: url('path/to/image.png'); rule sets the image located at 'path/to/image.png' as the marker for unordered lists (<ul>). Each list item in the unordered list will be displayed with the custom image as the bullet.

You can also use the list-style-image property with ordered lists (<ol>) to replace the default numbering with custom images.

ol {
  list-style-image: url("path/to/image.png");

Remember to specify the correct path to the image file to ensure that the image is displayed as the list marker. Additionally, it’s important to choose images that are visually appropriate and provide sufficient contrast against the background for optimal legibility.