The 'Geometry of Product Edge' refers to the design and shape characteristics of building products' edges that influence their disassembly and recyclability potential in the context of Building circularity. It considers factors such as the shape, connections, and interfaces of the edges, which impact the ease of disassembly and material recovery for reuse or recycling. Designing building products with favorable Geometry of Product Edge facilitates efficient material recovery and promotes circularity in the construction industry.