RemixIconEx.System.check_double

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

check_double(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.check_double()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M11.602 13.76l1.412 1.412 8.466-8.466 1.414 1.414-9.88 9.88-6.364-6.364 1.414-1.414 2.125 2.125 1.413 1.412zm.002-2.828l4.952-4.953 1.41 1.41-4.952 4.953-1.41-1.41zm-2.827 5.655L7.364 18 1 11.636l1.414-1.414 1.413 1.413-.001.001 4.951 4.951z" />
</svg>

example usage

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