RemixIconEx.Document.folder_3

You're seeing just the function folder_3, go back to RemixIconEx.Document module for more information.
Link to this function

folder_3(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Document.folder_3()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M12.414 5H21a1 1 0 0 1 1 1v14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h7.414l2 2zM4 7v12h16V7H4z" />
</svg>

example usage

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