Chad Baldwin does some interesting things with Unicode characters:
I don’t want to get too far into the weeds explaining encodings, code points, etc. Mostly because you can just Google it, but also because it’s very confusing. Despite all the hours I’ve spent trying to learn about it, I still don’t get a lot of it. There’s also a lot of nuance regarding encodings when it comes to SQL Server, different collations, and different SQL versions. However, I did come across this blog post that seems to break it down well.
Click through for a few scenarios, including things like tracking progress or marking data in a manner that’s easier to see then “True” and “False” values in columns.