In the past I often referred to NYIF cable, now I found a pic of it.
It's about my favourite type of cable because it's easier to install in old plaster walls than NYM. The price is rather hefty, 79 ct/m compared to 59 ct for NYM at Conrad Electronics and about 18ct/m at most hardware stores.
As you can see it'S very flat and hence perfect to install in walls or ceilings with very thin plaster (e.g. concrete ceilings). Most of all you can just drive nails between the conductors to secure it, and I don't mean tiny toy nails. I've used 70mm nails in walls with crumbly mortar between the bricks. It's lsited for use in all domestic and (I believe) commercial environments but not in agricultural structures, and it's only listed for use in plaster and brick/concrete/... walls, not in any wood structures. That is because the outer sheathing is pretty thin compared to any other type of cable. NYIF used to be very common in the 1950ies to 80ies, then NYM almost killed it in Austria, along with conduit (PVC flex) that has always been very popular here. In Germany there are still many electricians who prefer NYIF. The last time I wanted to buy some the electrician asked me: "_What_ do you want? _No one_ buys that any more!". Then she went to the back of the shop, returned with a huge coil of the cable and started unraveling the 10m I had ordered. While doing that she almost tripped over the loops of cable on the floor several times, almost if she were doing some weird dance... the fun was almost woth the extra price!