To meet Wikipedias quality standards, this article or section may require cleanup. ... A skull and crossbones is a symbol consisting of a human skull and two bones crossed together under the skull. ... Dangerous goods are substances which pose risk to health, safety, property or the environment during operation and/or transportation. ... UH 25 is a fuel mixture for rockets. ... Toxicity Class refers to a classification system for pesticides created by a national or international government-related or -sponsored organization. ...