# Church–Kleene ordinal

> the order type of the set of all recursive ordinals

**Wikidata**: [Q5118283](https://www.wikidata.org/wiki/Q5118283)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Nonrecursive_ordinal)  
**Source**: https://4ort.xyz/entity/church-kleene-ordinal