RemixIconEx.Development.brackets

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

brackets(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Development.brackets()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M9 3v2H6v14h3v2H4V3h5zm6 0h5v18h-5v-2h3V5h-3V3z" />
</svg>

example usage

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