A zine is a small sort of soft cover book. There are zine festivals and an entire cool diy sort of culture around "zines". The reason I am qualifying my mini-books as zines is because it's easier to understand that way and also in the publishing world they actually call 10-12,000 word projects "pamphlets" and that seems more confusing than "zines".
Don't see the answer to your question? Ask the project creator directly.