Alnilam (stars.astro.illinois.edu) ALNILAM (Epsilon Orionis). Three brilliant stars mark the belt of Orion the Hunter, from right to left (west to east) Mintaka, Alnilam, and Alnitak.
Tridecagon (Wikipedia) In geometry, a tridecagon or triskaidecagon or 13-gon is a thirteen-sided polygon.
