RemixIconEx.System.upload_2

You're seeing just the function upload_2, go back to RemixIconEx.System module for more information.
Link to this function

upload_2(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.upload_2()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M4 19h16v-7h2v8a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1v-8h2v7zm9-10v7h-2V9H6l6-6 6 6h-5z" />
</svg>

example usage

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