I'm enjoying the Probability for Everyone post. I'm also quickly reminded how complex the notion used in Probability Theory is. Lowercase, uppercase, script uppercase, double struck uppercase, and Greek uppercase all have specific meanings (sometimes multiple meaning), and they get held together with the set theory symbols. It's even worse since some people use different characters for inconsequential things, and then there's situations (online forums) where the notation can't be used and substitutes are made, I even recall some books using bold letters which made note taking a real hassle.