There are multiple definitions:

1. noise-to-harmonics ratio(English)

   • HNR, SNR
   • Signal analysis, Ratio-based metric

2. N-terminal heptad repeat(English)

   • region that is crucial for membrane fusion
   • CHR, ZFERV
   • Virology, Membranes
   • https://doi.org…brc.2015.03.081

3. nuclear hormone receptor(English)

   • mediates actions as ligand-dependent nuclear transcription factor
   • AAA, ADMA, AE-PCOS, AR, BRFSS, CPA, CVD, DHT, eNOS, ER, ERß, GPER, LGBTQ, MMP, RAAS
   • Transcription, Atherosclerosis /atherogenic
   • https://doi.org…sis.2023.117282