uh-ah, I think this topic is good one...
not sure of the comment of not being good practise gets my hair up.
and the length of the hair is not so small.
anyway, it is mostly used as "null" operand to direct "noise" to.
but I use it in many places as the main var.
not good practise goes into the way that it's not "hungarian notation" etc.
dollar sign anyway shouldn't be used in strings like manual states...
so I don't see a reason of it not being a good practise other than some newbies getting confused
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