RemixIconEx.System.close_circle

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

close_circle(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.close_circle()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M12 22C6.477 22 2 17.523 2 12S6.477 2 12 2s10 4.477 10 10-4.477 10-10 10zm0-2a8 8 0 1 0 0-16 8 8 0 0 0 0 16zm0-9.414l2.828-2.829 1.415 1.415L13.414 12l2.829 2.828-1.415 1.415L12 13.414l-2.828 2.829-1.415-1.415L10.586 12 7.757 9.172l1.415-1.415L12 10.586z" />
</svg>

example usage

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