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List

A list is a sequence of scalar values enclosed in parentheses. The following is a simple example of a list: (1, 5.3, "hello", 2)

This list contains four elements, each of which is a scalar value: the numbers 1 and 5.3, the string hello, and the number 2.

Lists can be as long as needed, and they can contain any scalar value. A list can have no elements at all, as follows:
()
This list also is called an empty list.

NOTE
A list with one element and a scalar value are different entities. For example, the list
(43.2)
and the scalar value
43.2
are not the same thing. This is not a limitation because one can be converted to or assigned to the other.