It doesn't exist at all, because it does not make any sense

There's many nonsense things which exist tho.

I do not want to discuss usefulness of negative 0 or lack thereof, but there are some context where -0 exists, and is distinguishable from 0. IEEE-754 representation of floating point numbers is one of such situations.

-0 exists, sometimes.

Maybe because it's a number and not a string? And the compiler has some autofix for zero?

Or I don't understand your question.

-0 doesn't really exist. It's still 0.