I have looked at a LOT of these equity exo notes in 2016. Offered by every bank, but especially the yanks (e.g. Citi, Stanley, etc).
A typical one is a callable range accrual note linked to, say, a basket of equity indices (e.g. FTSE and SPX). There are lots of other different variations of these, both in terms of payout features, but also in terms of the underlying (linked to single names, commodity prices, etc etc).
These things work bigly yuge for the banks, for a whole variety of reasons. Occasionally, they are not too shabby for the investor, but the pricing matters.