Gennaker, Drifter, DRS, etc...
You are partially right about the cross between a genoa and a spinnaker, and hence the name. They are also called slasher, flashers, DRS, Drifters, etc, etc. IMHO they are closer to an asymetrical spinnaker. You do not pole it. They are tacked in front of the stay, and like a spinnaker, the sheets are run outside to blocks as far back as possible, then back to the winch. The up-wind sheet is passed in front of the stay and inside of the gennaker itself, allowing to gybe.I use one regularly on my 34, even when sailing solo. If you get one, and do much soloing, get one with a sock so you can snuff it and store it easily.