The European Union (EU) requires that risk phrases (R-phrases) appear on each label and safety data sheet for hazardous chemicals. R-phrases consist of the letter R followed by a number. The precise meaning of each of these appears in the table below. Labels will also have symbols or pictograms (see CHIP), but the R-phrase specifies the particular danger(s). For example, sodium metal may have a large F and flame icon on the label, but the particular risk is denoted by R14/15 and R34 which correspond to "Reacts violently with water liberating highly flammable gases" and "causes burns". Safety phrases (S-phrases) for handling precautions are also part of the same requirements.