Two Vs. One
Here's the dirt on how these objects relate to one another:
Two is the successor of one. There are many relationships between the two numbers: 2=1+1, 2*1=1, 2^1=2, 1^2=1, and so on. In C notation, 2=1<<1.
Metrics
Parity Two: even. One: odd.
Parity Two: even. One: odd.