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I have to agree with you. One argument that might be given in favor of using both directions is that the standard menu triangle or > (the one that appears on drop-downs, for example) shows directionality. That argument, however, doesn't hold, as unlike with the majority of icons, arrows are necessarily directional. If you look at icons for buttons that ...


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Some good solutions already mentioned. Here but another to consider: Use color, number or letter identifiers for the column and a legend.



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