Whether in part to budget constraints by a studio, or simply due to the need to end off a good thing before it gets too stale, television series have to have a beginning and an end. However, an ending doesn't necessarily have to be a simple goodbye to the general audience.
Titles of some of the most revered series often indicate a subtle nod if viewers have been paying attention. This can come to us as another form of satisfaction, even if the series finale in question has been anything but. If named appropriately, they definitively make much more of an emotional impact than a finale entitled The Finale (yes, Seinfeld continues to divide us to this day).
A good series finale title validates a story arc that has been intricately woven throughout the show's preceding seasons. Or, it gives credence to a discussion beyond the respective storyline. The best TV series finales put all their chips onto the table, in hopes that viewers and critics alike will enjoy their last hurrah.
Some have accomplished that feat - and their success began with a very, clever series finale title.