# HRR

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> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

**HRR** may refer to:

- [Haploid-relative-risk](/source/Haploid-relative-risk), a method for determining gene allele association to a disease
- [Hardy, Rand & Rittler](/source/Color_vision_test#HRR_plates) pseudoisochromatic plates, a type of color vision test
- [Harrington railway station](/source/Harrington_railway_station), in England
- [Healy River Airport](/source/Healy_River_Airport), in Alaska, United States
- [Heart rate reserve](/source/Heart_rate_reserve)
- [Henley Royal Regatta](/source/Henley_Royal_Regatta)
- [High refresh rate](/source/Refresh_rate), 120Hz or higher
- [Hirzebruch–Riemann–Roch theorem](/source/Hirzebruch%E2%80%93Riemann%E2%80%93Roch_theorem)
- *[Historicorum Romanorum reliquiae](/source/Historicorum_Romanorum_reliquiae)*, a collection of ancient fragmentary Latin history-works
- *[The History of Rock and Roll](/source/The_History_of_Rock_and_Roll)*, a radio documentary
- [Holy Roman Empire](/source/Holy_Roman_Empire) (German: **Heiliges Römisches Reich**)
- [Homologous recombination repair](/source/Homologous_recombination_repair), a major DNA repair pathway that mainly acts on double-strand breaks and interstrand crosslinks
- [Hondo Railway](/source/Hondo_Railway), an American railway
- [Horuru language](/source/Horuru_language), dialect of Yalahatan, spoken in Indonesia ISO 639-3 code hrr
- HRR, a [Rockwell scale](/source/Rockwell_scale) of materials' hardness

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Adapted from the Wikipedia article [HRR](https://en.wikipedia.org/wiki/HRR) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HRR?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.