RemixIconEx.Document.file_4

You're seeing just the function file_4, go back to RemixIconEx.Document module for more information.
Link to this function

file_4(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Document.file_4()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M21 16l-6.003 6H4a1 1 0 0 1-1-1V3a1 1 0 0 1 1-1h16a1 1 0 0 1 1 1v13zm-2-1V4H5v16h9v-5h5z" />
</svg>

example usage

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