There are multiple definitions:

1. atrial natriuretic factor(English)

   • aka ANP
   • ANP, BNP
   • Biomarker

2. anti-nuclear factor(English)

3. auditory nerve fiber(English)

   • type‐I is primary afferent neuron, excited by cochlear ribbon synapse, also called type‐I spiral ganglion neuron
   • AMPA, EPSC, IHC, OHC, HHL, SPL, TIP
   • Auditory system, Neurology
   • https://doi.org/10.1113/JP279189
   • https://doi.org…res.2018.06.003