Sub-zero is anything that is less than zero. That means that-1 degree, -2 degrees, -3 degrees, etc. are all 'sub-zero'.
To be complete, you also have to specify whether you are talking centigrade or Fahrenheit. When centigrade, it just means the same as below freezing (0 degrees centigrade). When Fahrenheit, sub zero is starting to be seriously cold since freezing is +32 degrees Fahrenheit.
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Sub Zero?
The symbol zero originated from the Indian sub-continent and was also used by the ancient Mayans but in a different form.
The Indian sub-continent where the zero symbol came from
No one knows for sure who invented the symbol for zero but it originated from the Indian sub-continent and was also used by the ancient Mayans of South America but was shaped differently