What is it called when a jury finds someone not guilty when they know they are?

When a jury finds someone not guilty despite believing they are guilty, it is referred to as "jury nullification." This occurs when jurors choose to acquit a defendant based on their personal beliefs or moral objections to the law or its application, rather than strictly adhering to the evidence and legal standards presented during the trial. Jury nullification highlights the power juries have in the legal system to influence outcomes based on conscience.