Five Vs. Zero
Here's the dirt on how these objects relate to one another:
Five and zero are, together, the most common rightmost digits of numbers which are arbitrarily chosen. We have a tendency, when required to pick an arbitrary number, to choose one which is a multiple of five, and it happens that multiples of five always have 0 or 5 as their rightmost digit. Similarly, numbers like 50, 500, 5000, and so on, are extremely over-represented in everyday use.
Metrics
Parity Five: odd. Zero: even.
Parity Five: odd. Zero: even.