- Catalan number (Wikipedia)
In combinatorial mathematics, the Catalan numbers are a sequence of natural numbers that occur in various counting problems, often involving recursively defined objects. They are named after the French-Belgian mathematician Eugène Charles Catalan.
- Kappa Scorpii (stars.astro.illinois.edu)
KAPPA SCO (Kappa Scorpii). The curves of stars that make the body of Scorpius, the Scorpion, is one of the most dramatic and recognizable figures of the nightly sky. At the southeastern end, just short of the two-star “stinger” (made of Shaula and Lesath) lies bright, second magnitude (2.41) Kappa Scorpii, which if in most other constellations would bear a proper name, but here tends to be lost among the host of other bright stars.
