The origin. The point on the cartesian plane where both x and y are zero. The x-intercept of x=y, and the y-intercept of y=x.
The top-left pixel on a monitor
Also the (trivial)solution to any homogenious differential equation of the form
a(subn)*dy^n/d^nx + a(subn-1)*dy^(n-1)/d^(n-1)x....... = 0
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