What does zero volume mean in physics?
Well, I guess I would answer that by looking at how Stephen Hawking and Roger Penrose,
when they developed the space-time theorems, recognized there was a singularity.
That when they were tracing the trajectories of particles back in space and time,
that they all came to a point where they coalesced and the laws of physics broke down.
And so, what exactly the nature of the singularity is a little bit unknown,
but it's a sign that the laws of physics broke down, and that's what they said.
Looked like a beginning.