OS X 10.5.8
So, an OS that is now 5 years old and
beyond end of life (no more security fixes). You shouldn't even be allowed online with that.
There are plenty of older systems around, if you really want to enforce your ideal OS standard then I'll believe it when you turn up on my doorstep. I'm easy to find.
At the very least, it's grounds for automatic ignoring complaints about standard things not working for you. The bugs were already fixed, you're just using a known-buggy version.
If this is truly a serious discussion about adopting a standard symbol.... whatever is picked should display on the least advanced media..
like a green screen WYSE terminal. Vt100 terminal, etc.
Or a piece of paper.
Suggesting that people who aren't upgraded to the latest version of something should be discounted is really elitist.