This graph is the unique rank-3 strongly regular graph with parameters $(3510,693,180,126)$. This graph is the unique connected graph that is locally the $\mathrm{U}_6(2)$ polar graph. The $\mu$-graphs of this graph are $\mathrm{NO}_6^-(3)$ graphs. This graph is a supergraph of the $\mathrm{NO}_7^{- \perp}(3)$ graph.
| Number of vertices: | $3510$ |
| Diameter: | $2$ |
| Intersection array: | $\{693,512;1,126\}$ |
| Spectrum: | $693^1 63^{429} (-9)^{3080}$ |
| Automorphism group: | $\mathrm{Fi}_{22}.2$ |
| Distance-transitive: | Yes |
| Primitive |