I've copyrighted the term "copyrightt" (not really, but see a previous thread by using the Search option, if you're really bored), so I'll demonstrate little text: COPYRIGHTT TM (Yes, I know copyrights and trade marks aren't the same; so sue me. No, I'll sue you! For copyrightt infringement!).
But the strike text option seems to be, well, on strike and no longer here.