ISO 3864 specifies international standards for safety signs and markings in workplaces and public facilities. These labels are graphical, to overcome language barriers. The standard is split into four parts:
|Meaning||RAL Name||RAL Number||RGB Hex||Example of Colour|
|Prohibition/Fire Equipment||Signal Red||3001||#9B2423|
|Safe Condition||Signal Green||6032||#237F52|
|Backgrounds and Symbol||Signal White||9003||#ECECE7|
In addition, ISO standard 3864-2:2016 lays out the following colours that correspond to levels of risk. This standard adds "Orange" as an incremental colour to the pallette above.
|Meaning||Background colour of panel||Contrast colour||Definition||RGB Hex||Example of Colour|
|Low level of risk||Yellow||Black||RAL 1003 [per ISO 3864-4]||#F9A800|
|Medium level of risk||Orange||Black||RAL 2010, Munsell 2,5YR6/14G, or Munsell 5YR6/15G||#D05D29|
|High level of risk||Red||White||RAL 3001 [per ISO 3864-4]||#9B2423|
The corresponding American standard is ANSI Z535. ANSI Z535.1 also explicitly uses multiple levels of hazard, including Yellow (Pantone 109) for 'caution' messages, and Orange (Pantone 151) for stronger 'warning' messages. Like ISO 3864, ANSI Z535 includes multiple sections: ANSI Z535.6-2006 defines an optional accompanying text in one or more languages.
ISO 3864 is extended by ISO 7010, which provides a set of symbols based on the principles and properties specified in ISO 3864.