I’ve never seen unicode mathematics written down quite as simply as Hixie’s unicode crash course.
Read it? Frightened? Good. And yes, that was the simplest version. You can imagine how complex it gets. UTF-16, anyone?
It is, however, worth the effort to incorporate unicode in any product that you build. The benefits include internationalisation, future-proofing, and kudos from anyone else who cries at the sight of that maths.
Incidentally, if you want to see unicode characters visit this fantastic unicode resource.