4 standards, all here:
ISO 9186-1:2014 Graphical symbols -- Test methods -- Part 1: Method for testing comprehensibility
ISO 9186-2:2008 Graphical symbols -- Test methods -- Part 2: Method for testing perceptual quality
ISO 9186-3:2014 Graphical symbols -- Test methods -- Part 3: Method for testing symbol referent association
ISO 17724:2003 Graphical symbols -- Vocabulary
links:
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or
[link Point to another website Only the registered members can access]



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