The term 'Heist Unit' refers to a specialized police unit that is tasked with investigating and apprehending criminals involved in heists. The two crossword solutions for this term are GRAND, which is an acronym for 'Gang Raid and Narcotics Detail', and ONEG, which stands for 'Organized and Non-Traditional Enforcement Group'. Both of these units are part of the larger Heist Unit and are responsible for investigating and apprehending criminals involved in heists.