What is the meaning of #XXX in code comments?

Question

I have seen this a lot in code, even vim marks it as a special case. #TODO and #FIXME are two other fix markers vim highlights but what does

Answer 1

I use XXX because it's easier to type than TODO.

XXX is for when you're in a hurry and will get back to this yourself.

TODO is for when you have to hand it off to someone else.