On a page that's just one humongous table, I have an img in each <th> that tells the user how the column is sorted; and he can click the thing to toggle the polarity of the sort.
Until now, I've used a stylized arrowhead for ascending sort. I have the idea that this is pretty much accepted practice.
But that's always bothered me: it takes me a moment to remember that up-arrow means ascending; and that ascending means small-to-big. So I'm using another graphic now for ascending.
Likewise for a descending sort.
Does anybody see any kind of UX problem with this?