The symbol is typically written N but it's actually with a double diagonal line ℕ. It includes 1,2,3,4,5,6 etc (not 0). Z+ means the same.
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It is Z from the German for "to count". The counting, or natural numbers are denoted by N.
Yes, all natural numbers are real numbers. Natural numbers are a subset of real numbers, so not all real numbers are natural numbers.
+ is the symbol for adding two numbers together.It is usually called the plus symbol.
No. Natural numbers are a subset of whole numbers. Negative numbers are whole numbers but not natural.
The main subsets are as follows:Real numbers (R) can be divided into Rational numbers (Q) and Irrational numbers (no symbol).Irrational numbers can be divided into Transcendental numbers and Algebraic numbers.Rational numbers contain the set of Integers (Z)Integers contain the set of Natural numbers (N).