"Thematic elements", or "thematic material", is a term used by the Motion Picture Association of America and other film ratings boards to highlight elements of a film that do not fit into the traditional categories such as violence, sex, drug use, nudity, and language, but may also involve some degree of objectionable content. This rating reason raises a warning to parents and guardians to learn more about a film before they allow their children to view it. In Australia, the term is equivalent to "adult themes", "mature themes" or just "themes" (which has been in use since 2005).