Multiple Mortgages
A multiple mortgage is a mortgage held by 2-4 people, with the amount lent being based on the incomes' of all those people.
The property being purchased is also jointly owned by all the people on the mortgage - so four friends might buy a house, based on all four of their incomes, and 25%-owned by each of them.
Multiple mortgages have been around for a few years now, but over the last couple of years have experienced a surge in popularity as house prices have continued to rise, pricing many first-time buyers out of the market.