Symbol 4 : Pictogram appearing on user labels for packaged goods, also characterised by a letter (e.g. picture of flame and F+: very flammable substance)
The Association of Petrochemicals Producers in Europe (APPE), The European petrochemical industry, Glossary of Terms on Chemical Safety for Use in IPCS Publications, van Nieuwenhuyse, Brussels 2006. http://www.petrochemistry.eu/glossary.html, (Petrochem Ind - Brit) {473}