There is (or used to be) a set of tags that would let you display text with a strikethrough.
I’ve tried s, [strike]strike[/strike], [strikethrough]strikethrough[/strikethrough] and [strikeout]strikeout[/strikeout].
No luck with any of them.
There used to be a link when posting where you could bring up a list of the various bbcode values but that isn’t there any more. A quick google suggests either ‘s’ or ‘strike’ might be the answer but they aren’t working, obviously.
Has this one been removed?