The big, fancy language scholar term for this particular use of the definite article, “the”, is “modadic” in : modadic/

Why is there only

one money collection in the universe? My friend and colleague have said this.

References:

8. Monadic.

(literally, one of a kink). (Moved

by any

name). The Articles and Methods include particular examples. The Articles are quite similar, and they are not identical but are singular.