+A [number](/wiki/number) less than [zero](/wiki/zero), a negative number signifies deficit or an opposing quantity. It extends the [number line](/wiki/number_line) beyond its origin, encompassing concepts like debt or temperatures below freezing.
+## See also
+- [Positive Number](/wiki/positive_number)
+- [Integer](/wiki/integer)
+- [Real Number](/wiki/real_number)
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