- Kaus Borealis (stars.astro.illinois.edu)
KAUS BOREALIS (Lambda Sagittarii). Occupying a key position within the constellation Sagittarius, Kaus Borealis makes the northern tip of the Archer’s bow, the hybrid name meaning just that, the “northern (Borealis from Latin) bow (kaus, from Arabic).
- 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.