Regarding the note, in statistics you could call that a population parameter. While parameters that are used are normally things like “mean” or “standard deviation”, the definition is broad enough that “the centre of mass of a collection of atoms” plausibly fits the category.
Regarding the note, in statistics you could call that a population parameter. While parameters that are used are normally things like “mean” or “standard deviation”, the definition is broad enough that “the centre of mass of a collection of atoms” plausibly fits the category.