RemixIconEx.System.download

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

download(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.download()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M3 19h18v2H3v-2zm10-5.828L19.071 7.1l1.414 1.414L12 17 3.515 8.515 4.929 7.1 11 13.17V2h2v11.172z" />
</svg>

example usage

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