ISO 9186-3:2014
Graphical symbols -- Test methods -- Part 3: Method for testing symbol referent association
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NOTE 1 Alternatively, it could be necessary to inform people about the meaning of the graphical symbol by including its meaning in manuals, instructions, or training.
NOTE 2 ISO 9186‑1 specifies a method for testing the comprehensibility of graphical symbols. ISO 9186‑2 specifies a method for testing the perceptual quality of graphical symbols, the extent to which the elements of the graphical symbol can be correctly identified.