ISO 3864

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ISO 3864 specifies international standards for safety symbols. These labels are graphical, to overcome language barriers. There is an alternative American standard, ANSI Z.535, which is incompatible with the international standard. The ANSI standard requires an accompanying text (see ANSI Z535.6-2006), which can pose problems for environments in which people expected to understand the sign may not read the language or may not read at all, including many workplaces in the USA.