Yes, and the leftward/rightward distinction applies only to list operators, which the Camel Book’s Glossary (p. 1064) defines as follows:

list operator

An operator that does something with a list of values, such as join or grep. Usually used for named built-in operators (such as print, unlink, and system) that do not require parentheses around their argument list.

Of the functions listed in Chapter 27 of the Camel Book, the list operators are those which take a LIST as their only, or final, argument. Thus, any user-defined subroutine with a prototype having @ as its final element is also a “list operator.” (See perlsub#Prototypes.)

Hope that helps,