>>>Instead of 1,2,3 and 4 why not T,Y,W and M?
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>>Because, it won't be generic anymore for users of other languages. Also, those four icons represent the same type of transaction as oppose to the other 3 next so that's why the number mostly regroup them together.
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>What about 0, -1, -7 and -31 ?

I personally think it's worst. But, then again, that's only my opinion. I wouldn't want to change that right now. As many mentioned, we had enough changes at that level for a while. I prefer to concentrate on other requested features by members.