Sometimes a noun refers to a type of objects, for example, "a virus" always refer to a type of virus, not a unit of a virus. It's difficult to refer to a single unit of a virus. I've heard people saying "a virus particle".
I'm working with digital assets. It seems in finance, "asset" always refers to a type, like "virus". People say: "you need multiple assets to diversify your investments". In another example, "an asset of mine is property", which might be a house, two or many houses.
"asset" as a word does not always refer to a type. In intelligence, "an asset" is an actual piece (or person), like "we have an asset in the Middle East".
What would be the word of choice for a single portion of a digital asset? What if I am to refer to a piece of music, a single crypto kitten, not a type of them? I'm thinking of "asset-piece" or "token", where "token" suffer from the same problem (typically it refers to a type).