Other Uses
- arp, the ISO 639-3 code for the Arapaho language, a Native American language
- arp, the customary symbol for the arpent, an obsolete agrarian unit of distance and area measurement
- Arp, a rosemary cultivar
- Arp2/3 complex, a protein
- Arp, Georgia, United States
- Arp, Tennessee
- Arp, Texas
- Arp number, a numbering system for galaxies, designed by Halton Arp
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