I asked the same question when I started. It means Fanned & Watching. :-) just to help you out , it is best to send with tracking number. Its like a dollar more. Butyou can sendwithout one.
If you use PayPal shipping it shouldn't be more than 2 bucks and tracking is free! You can print out your own labels. Very easy, and saves a ton, especially when the post office charges ridiculous rates these days. But, for my more expensive, bigger items like electronics I use flat rate boxes. Worked well for my last 3 big auctions.