Manga Ratings
Unlike the original Japanese versions, VIZ has made several major changes in publishing series, for example: the seventeenth volume of Dragon Ball is labeled in North America as the first volume of Dragon Ball Z, and are given two different categories in rating as well as in editions. VIZ also has "manga ratings" for their products;
A - All Ages; May be suitable for readers or consumers of any age. For example, may contain mild language and fantasy violence but no swearing or nudity. The Pokémon, Dinosaur King and Dragon Ball Z manga carry this rating.
T - Teen; 13 years or older. May be suitable for early teens and older. For example, may contain violence, infrequent use of strong language, suggestive themes or situations, crude humor, alcohol and/or tobacco use. May contain material some people may find inappropriate. The Dragon Ball, One Piece, Naruto, Bleach and Yu-Gi-Oh! manga have this rating.
T+ - Teen Plus (Older Teen); May be suitable for older teens and adults. For example, may contain intense and/or gory violence, sexual content, frequent strong language, alcohol, tobacco and/or other substance use. The Detective Conan (Case Closed), Death Note, Hunter × Hunter and Gintama manga have this rating.
M - Mature readers; Suitable for adults only. May contain extreme violence, mature themes and graphic depictions. The Vagabond and Black Lagoon manga have this rating.
Read more about this topic: Viz Media