In a question/answer, the Bold tags are 2x asterisks:
And Italics is a single asterisk:
However, in the comment fields, why are they different?
Sorry. I previously had single asterisks below. Infact, it should have been double.
Double asterisk for Bold:
And underscore for Italics.
I sometimes get confused and commenting and/or writing a question/answer.
EDIT: So, I got this info from the 'help' buttons. In the question/answer help icon, it automatically used asterisks only.
However, in the 'help' of the comments, it states to use underscore:
I have just always followed the 'help' buttons.