What is non fungible in law?

FIRST to define "fungible:" Funglibles are goods which are interchangeable, often sold or delivered in bulk, since any one of them is as good as another. Fungible goods have no distinguishing characteristics from others of like kind, such as grains or oils, so that they can be easily replaced or substituted. When items are sold by weight or number, that is an indication that they may be fungible goods." (See below link)

Therefore, non fungibles are anything the above definition does not include or to which it does not apply.