The ADAM collecters in the Bioshock series are known as Little Sisters.

The statement is true because in the BioShock series, the characters referred to as "Little Sisters" are a genetically modified group of young girls who gather a substance called ADAM. ADAM is a valuable resource in the game, as it allows for genetic enhancements and powers, making it highly sought after by the game's protagonists. These Little Sisters are accompanied and protected by giant mechanical creatures known as "Big Daddies," creating a unique and memorable dynamic in the series.