RemixIconEx.Document.contacts_book_upload

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

contacts_book_upload(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Document.contacts_book_upload()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M19.005 2C20.107 2 21 2.898 21 3.99v16.02c0 1.099-.893 1.99-1.995 1.99H3V2h16.005zM7 4H5v16h2V4zm12 0H9v16h10V4zm-5 4l4 4h-3v4h-2v-4h-3l4-4zm10 4v4h-2v-4h2zm0-6v4h-2V6h2z" />
</svg>

example usage

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