RemixIconEx.System.settings

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

settings(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.settings()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M12 1l9.5 5.5v11L12 23l-9.5-5.5v-11L12 1zm0 2.311L4.5 7.653v8.694l7.5 4.342 7.5-4.342V7.653L12 3.311zM12 16a4 4 0 1 1 0-8 4 4 0 0 1 0 8zm0-2a2 2 0 1 0 0-4 2 2 0 0 0 0 4z" />
</svg>

example usage

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