[operation] insert element at front [common name(s)] push, cons [Ada] Prepend [Java] offerFirst [Perl] unshift [PHP] array_unshift [Python] appendleft [Ruby] unshift [JavaScript] unshift [C++] 
push_front
p u s h _ b a c k
p u s h _ f r o n t
p o p _ b a c k
p o p _ f r o n t
b a c k
f r o n t