How to Add Icons to WordPress Custom Post Type?

The following code snippet registers a new custom post type called Books in WordPress. A unique Dashicon (dashicons-book) is assigned to this post type in the WordPress admin menu for easy identification.

function ts_custom_post_type_with_dashicon() {
    $args = array(
        'labels' => array(
            'name' => 'Books',
            'singular_name' => 'Book'
        ),
        'public' => true,
        'has_archive' => true,
        'menu_icon' => 'dashicons-book', // Using Dashicon for the custom post type
        'supports' => array('title', 'editor', 'thumbnail')
    );

    register_post_type('book', $args);
}

add_action('init', 'ts_custom_post_type_with_dashicon');