Hi, I'm looking for a font that is commonly used in mathematics, similar to blackboard font (\mathbb{}) for special number sets. Problem is, I don't know what it is called, and can't say specifically what it's used for, I just remember seeing it somewhere. I think the context was families of sets, such as the powerset, but I'm sure I've sen it used for other things too.

Anyway, there can't be that many common fonts used for maths, so can someone give some examples using LaTeX?

Thanks