# reflecting cardinal

> large cardinal number 𝜅 for which there is a normal ideal I on 𝜅 such that for every 𝑋∈𝐼⁺, the set of 𝛼∈𝜅 for which 𝑋 reflects at 𝛼 is in 𝐼⁺

**Wikidata**: [Q7307233](https://www.wikidata.org/wiki/Q7307233)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Reflecting_cardinal)  
**Source**: https://4ort.xyz/entity/reflecting-cardinal