What is "t-x"

T-X (referred to as the Terminatrix in some appearances) is the name of a fictional character who appears in the Terminator franchise. The T-X model is a gynoid assassin with a human-female appearance. The character was introduced as the main antagonist in the 2003 film Terminator 3: Rise of the Machines, portrayed by Kristanna Loken. The T-X has the ability to assume the appearance of other characters; therefore, several other cast members occasionally portrayed the T-X throughout the film. This ability to shapeshift is similar to that of the T-1000, the main antagonist of Terminator 2: Judgment Day.