HTML Symbol Entities issue on Blogger

I have received a few requests on how to deal with the HTML Symbol Entities issue on Blogger. There really isn't a problem because you can just click the box below for your post and your character(s) will display correctly.

ERROR

Your HTML cannot be accepted: Tag is broken: xxxxx

☐ Stop showing HTML errors for the body of this post

However, here are some good references for HTML Symbol Entities

http://www.w3schools.com/tags/ref_symbols.asp

http://www.ascii.cl/htmlcodes.htm

http://www.webstandards.org/learn/reference/charts/entities/symbol_entities/

http://webdesignerwall.com/tutorials/using-html-symbol-entities

http://www.entitycode.com/