Yep, those are ribbon tails, simply split tails with pretty long, thin lobes
While I'm at it, I could describe a couple of other, common kinds of tails...
Butterfly tail, barely V-shaped with large pointy lobes, as the name suggests, it has a somewhat butterfly shape.
Veiltail, a very long, flowing double tail with straight edges, as in, not V-shaped. Looks more like the skirt on a dress.
Fringe tail, like a V-shaped veiltail. Long and flowing but with the normal lobes