ISO 3864 specifies international standards for safety symbols. These labels are graphical, to overcome language barriers. The standard is split into four parts:
- ISO 3864-1:2011 Part 1: Design principles for safety signs and safety
- ISO 3864-2:2016 Part 2: Design principles for product safety labels
- ISO 3864-3:2012 Part 3: Design principles for graphical symbols for use in safety signs
- ISO 3864-4:2011 Part 4: Colorimetric and photometric properties of safety sign materials
The corresponding American standard is ANSI Z535, which is incompatible with the ISO standard. ANSI standard ANSI Z535.6-2006 defines an optional accompanying text in one or more languages.