# Moser spindle

> undirected unit-distance graph requiring four colors

**Wikidata**: [Q1443782](https://www.wikidata.org/wiki/Q1443782)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Moser_spindle)  
**Source**: https://4ort.xyz/entity/moser-spindle


## References

1. House of Graphs