RemixIconEx.System.login_box

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

login_box(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.System.login_box()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M4 15h2v5h12V4H6v5H4V3a1 1 0 0 1 1-1h14a1 1 0 0 1 1 1v18a1 1 0 0 1-1 1H5a1 1 0 0 1-1-1v-6zm6-4V8l5 4-5 4v-3H2v-2h8z" />
</svg>

example usage

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