RemixIconEx.Design.layout_4

You're seeing just the function layout_4, go back to RemixIconEx.Design module for more information.
Link to this function

layout_4(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Design.layout_4()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M20 3a1 1 0 0 1 1 1v16a1 1 0 0 1-1 1H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h16zm-9 10H5v6h6v-6zm2 6h6V5h-6v14zM11 5H5v6h6V5z" />
</svg>

example usage

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