Abstract We apply dimer diagram techniques to uncover discrete global symmetries in the fields theories on D3-branes at singularities given by general orbifolds of general toric Calabi-Yau threefold singularities. The discrete symmetries are discrete Heisenberg groups. with two Z N generators A. B with commutation AB = C BA. https://www.bekindtopets.com/quick-find-ICON-39290-Adjustable-Track-Bar-Kit-1999-2004-F250-F350-flash-buy/