- Sultan is incorporated on June 28, 1905 (historylink.org)
On June 28, 1905, the town of Sultan in Snohomish County is officially incorporated as a town of the fourth class. The voters of the small logging community, located at the confluence of the Sultan and Skykomish rivers a few miles east of Monroe, unanimously approved incorporation on June 10, 1905, and also elected their first mayor, Hartford M. Meredith (1840-1907), and other town officials.
- Schläfli symbol (Wikipedia)
In geometry, the Schläfli symbol is a notation of the form {p,q,r,…} that defines regular polytopes and tessellations.