There are a few syntactical elements in Perl 6, which start with a dot. These operators might look like a postfix operator, but they all are the forms of the calling a method on an object. Unlike Perl 5, the dot operator does not do any string concatenation.
.method calls a method on a variable. This works with both real objects and with those variables, which are not instances of any class, for example, built-in types like integers.
say "0.0".Numeric; # 0
say 42.Bool; # True
class C {
method m() {say "m()"}
}
my $c = C.new;
$c.m(); # m()