The Rating Meta Tag
The rating meta tag alerts search engines that your content is intended for general audiences, or if it should bear a restricted nature of some kind.
Example Rating Meta Tag:
Since I only design family friendly websites that are intended for viewing by everyone, I specify that it is appropriate for general audiences. If however, you are marketing your information, products and/or services to kids, you should get one of the kid-safe rating tags. You should also get one if you are creating adult sites in an effort to keep the young and innocent away from adult materials.