Deliverables are whatever you expected to receive when you paid money to get your project done.
Most deliverbales are in the form of documents - but there is no reason they have to be. If you want a physical prototype of your new gadget - than the physical object is the deliverable.
However - almost every physical object has been described and purchased by means of a document - and in modern terms - an electronic document at that. (In fact - some construction companies have made $1M pieces of equipment vanish into thin air at a keystroke - and the items were never heard from again. CRA and the IRS can do the same thing with people.)
If you asked a consultant to advise you and all you get is a load of hot air then that's the deliverable for that project. (And shame on you for not writing a better contract.)
Not all deliverbales come from outsiders - some come from your own project team. These internal delverbales are sometimes called "artifacts" - but it's really the same idea - somebody got paid to do something - and not just think about it.
If you asked for a fish and you got a stone - then you have a problem with one of your own deliverbales - probably a deliverable called a specification.