RemixIconEx.System.loader

You're seeing just the function loader, go back to RemixIconEx.System module for more information.
Link to this function

loader(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.loader()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M12 2a1 1 0 0 1 1 1v3a1 1 0 0 1-2 0V3a1 1 0 0 1 1-1zm0 15a1 1 0 0 1 1 1v3a1 1 0 0 1-2 0v-3a1 1 0 0 1 1-1zm8.66-10a1 1 0 0 1-.366 1.366l-2.598 1.5a1 1 0 1 1-1-1.732l2.598-1.5A1 1 0 0 1 20.66 7zM7.67 14.5a1 1 0 0 1-.366 1.366l-2.598 1.5a1 1 0 1 1-1-1.732l2.598-1.5a1 1 0 0 1 1.366.366zM20.66 17a1 1 0 0 1-1.366.366l-2.598-1.5a1 1 0 0 1 1-1.732l2.598 1.5A1 1 0 0 1 20.66 17zM7.67 9.5a1 1 0 0 1-1.366.366l-2.598-1.5a1 1 0 1 1 1-1.732l2.598 1.5A1 1 0 0 1 7.67 9.5z" />
</svg>

example usage

svg.icon {
  width: 96;
  height: 96;
}