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A series which claims to be a trilogy or have 3 parts but in reality does not.
Douglas Adams' Hitchhikers Guide to the galaxy claims to be a trilogy in 4 parts, making it a trollogy.

The Lord of The Rings series, if you count the Hobbit, it is a trollogy.
trollogy by Schweff December 13, 2012
Related Words
A trilogy whose third installment is pitiful
Want to have a night in and watch the Matrix Twology
twology by ponyboy5 November 29, 2009

the holy trilogy 

incorrectly assumed as the original star wars trilogy, the holy trilogy is actually the Spider Man trilogy made by Sam Raimi starring Tobey Maguire and Kirsten Dunst, the greatest superhero trilogy in existence, perhaps only second to the Dark Knight one
Even years after seeing the Holy Trilogy, I can still remember most of the dialogue!!! I am still worthy !!!

Grand Theft Auto The Trilogy: The Definitive Edition

Known as one of the greatest horror games ever made, GTA The Trilogy The Definitive Edition triumphantly remakes three non horror games into horror games. With eerie rain indoors, mutant abominations of human beings, and some of the best AI ever, your perception of reality truly begins to warp into something beautifully terrifying, this is a must play for any horror fan, not to mention the graphics are some of the best in a game yet, as expected of Rockstar Games.
Grand Theft Auto The Trilogy: The Definitive Edition is a long ass name.

Metroid Prime Trilogy 

The greatest first person shooter from Nintendo.
Filled with action, adventure, mystery, suspense and more!
I just destroyed the Mogenar War Golem!
That was a awesome fight in Metroid Prime Trilogy!!

Blood and Ice Cream Trilogy

A series of films created by Edgar Wright and Simon Pegg, starring Pegg and Nick Frost in the lead roles. Each film takes a specific film genre and makes and effort to Pilgrimize it. The first two installments, "Shaun of the Dead" and "Hot Fuzz," Pilgrimize zombie movies and buddy cop/action movies, respectively. The currently in-production third film, "The World's End" is supposed to apply the Pilgrimization technique to sci-fi films.

The name is derived from the fact the each film, in addition to featuring copious amounts of blood, features of different flavour of Cornetto ice cream. Red Strawberry for "Shaun of the Dead," Blue Classico for "Hot Fuzz," and Mint-Green Chocolate Chip for the upcoming "The World's End" (tennative).

Also known as the Three Flavours Cornetto Trilogy.
Dude, I cannot wait for the last installment of the Blood and Ice Cream Trilogy, it's gonna be awesome.