There are multiple definitions:

1. alpha-fetoprotein(English)

   • Biomarker

2. adiabatic fast passage(English)

   • MRI
   • Medical imaging

3. acute flaccid paralysis(English)

   • IPV, OPV, VAPP, WHO
   • Adverse effect
   • https://doi.org…science.1115547

4. advanced fragmentation pulse(English)

   • STTI, TFL, WTI, YAG
   • Laser technique, Urology
   • https://doi.org…345-025-05675-5