A number value represents a value of the type double, int, or long.
Examples
number nr // Create
a new variable named 'nr' that can contain any value
// of type double, int, or long.
nr = 70
// So, for example, we can store an int value into 'nr'.
nr = 3.14159 //
We can also store a double value.
// nr = "Hello" // But NO! We can't store a
string value.