- Possession Point State Park is a nature reserve in Island, Washington. Possession Point State Park is situated nearby to the hamlet Glendale, as well as near the neighborhood Picnic Point.
- 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.