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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 ...


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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