A unit is a means of equivocating an abstract symbol to another phenomenon. It is a means of equivocation.
In equivocating one phenomenon to another is to reorder one phenomenon into the likes and form of another. Equivocation is recursion as an act of copying. That which is measured is reordered into the mode of measurement.
For example in dividing an orange into x number of parts is to manifest the orange as copying what x is in form where the orange exists as an image of x.