There are two signal words that are incorporated in the Globally Harmonized System (GHS), they are danger and warning. Danger is used for more severe hazards and warning is used when identifying hazards that are less severe. It is generally understood that there should only be one signal word used per label despite how may hazards are the chemical presents. These signals alert the reader of the label regarding the potential hazard level of the contents. Signal words have become a requirement in the GHS labeling system.