Things in () separated by commas are called a list of things. Actually you don't even need the parentheses for the list, it just clarifies precedence. A list is an ordered set of scalar values. Examples of lists:
examples/arrays/list_literals.p6
#!/usr/bin/env perl6
use v6;
(1, 5.2, "apple"); # 3 values
(1,2,3,4,5,6,7,8,9,10); # nice but we are too lazy, so we write this:
(1..10); # same as (1,2,3,4,5,6,7,8,9,10)
(1..Inf); # represents the list of all the numbers
(1..*); # this too
("apple", "banana", "peach", "blueberry"); # is the same as
<apple banana peach blueberry>; # quote word
my ($x, $y, $z); # We can also use scalar variables as elements of a list
