åäö are fine. But I had to create a custom layout a few years back for the insanity that is {}[]`~$. And why do we have μ? (I know it's because it's a metric p

åäö are fine. But I had to create a custom layout a few years back for the insanity that is {}[]`~$. And why do we have μ? (I know it's because it's a metric prefix but has anyone ever used it instead of u?)