RemixIconEx.System.lock

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

lock(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.lock()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M19 10h1a1 1 0 0 1 1 1v10a1 1 0 0 1-1 1H4a1 1 0 0 1-1-1V11a1 1 0 0 1 1-1h1V9a7 7 0 1 1 14 0v1zM5 12v8h14v-8H5zm6 2h2v4h-2v-4zm6-4V9A5 5 0 0 0 7 9v1h10z" />
</svg>

example usage

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