アメリカのはこんな感じ＞＜
DOT CHART 15Hazardous Materials Markings,
Labeling and Placarding Guide
[pdf] https://www.fmcsa.dot.gov/sites/fmcsa.dot.gov/files/docs/Hazardous_Materials_Markings_Labeling_and_Placarding_Guide_508CLN.pdf