The Hazchem emergency action code of numbers, letters and diamonds give information to emergency services. Its use is required by the NZS 5433:1988 Code of practice for the transport of hazardous substances on land.
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}