Comic NT

Comic NT is a 1NT overcall showing a weak jump overcall in an unknown (but unbid) suit.

So, 1 - 1NT shows a weak jump overcall to 3 or 3 or 3.

Partner bids 2 if 3rd hand passes and you name your suit.

It is useful if you save your jump overcalls for something else (Roman, Ghestem, Intermediate, etc.)