RemixIconEx.System.check

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

check(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.check()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M10 15.172l9.192-9.193 1.415 1.414L10 18l-6.364-6.364 1.414-1.414z" />
</svg>

example usage

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