RemixIconEx.System.arrow_left

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

arrow_left(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.arrow_left()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M7.828 11H20v2H7.828l5.364 5.364-1.414 1.414L4 12l7.778-7.778 1.414 1.414z" />
</svg>

example usage

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