I've never heard of either (but I've seen both). The dinkus is probably more common. I thought initially that the asterism was a "therefore" sign thingy that I used to use a lot in my previous life in science/engineering.
But what I love about both of them is the names. I am now wondering if I can manage to get either or both in a story. On the other hand, I feel sad for the "therefore" that it doesn't have a neat name (along with the sad, related symbol the "because").
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