Saltire detected the symbol, which often appears with balls in the quadrants formed by the arms of the chi-cross, in standards that appear on the coins of Persepolis. She suggested that early Christians endorsed its solar symbolism as appropriate to Christ. She also wrote: "although it cannot be proved, ... in the white saltire of St. Andrew we still have a reminiscence of the old standard of the Persepolitan kingdom". In the old European Union standard, a black saltire set in an orange square is the hazard symbol for irritants (Xi) or harmful chemicals (Xn). It indicates a hazard less severe
Hazard symbol transportation. The United Nations has designed GHS hazard pictograms and GHS hazard statements to internationally harmonize chemical hazard warnings. Several European countries have started to implement these new global standards, but older warning symbols are still used in many parts of the world. European standards are set by: The Workplace Hazardous Materials Information System, or WHMIS, is Canada's national workplace hazard communication standard. The US-based National Fire Protection Association (NFPA) has a standard NFPA 704 using a diamond with four colored sections each with a number indicating severity 0—4 (0 for no hazard, 4 indicates a severe hazard). The red