When one of my favourite questions is updated, a little number appears in my profile as in: . What does this number refer to?
According to an answer to this meta.SO question: What does highlighting mean on the profile's “Favorites” tab?
The number next to the tab indicates how many posts have new answers since you last visited the tab.
Arturo Magidin in his comment has a different explanation:
I do not know, which of the two answers is correct. But I am adding this as an answer so that it will bump the post and there is hope that someone who knows more about this will notice the question.