Zero is just a concept, representing nothing. The absence of anything.
Concepts may or may not correspond with reality.
As it happens though we know a couple of things regarding reality. First, that where the universe isn't nothing is. Like in really nothing, zero. Not even time. Secondly, the universe is a zero-sum game. Whatever positive charge may exist in the universe, an equal negative exist. It is the basis of all physics. No double book-keeping in nature, it all equals exactly zero.
That if you ask me, is something to think about. Not discussing sematics over if a concept of nothing really can be said to represent nothing
