RemixIconEx.System.lock_2

You're seeing just the function lock_2, go back to RemixIconEx.System module for more information.
Link to this function

lock_2(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.lock_2()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M6 8V7a6 6 0 1 1 12 0v1h2a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H4a1 1 0 0 1-1-1V9a1 1 0 0 1 1-1h2zm13 2H5v10h14V10zm-8 5.732a2 2 0 1 1 2 0V18h-2v-2.268zM8 8h8V7a4 4 0 1 0-8 0v1z" />
</svg>

example usage

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