There are multiple definitions:

1. rapid eye movement(English)

   • RWL, UNREM, NREM, SWS, AASM, MSA, PD, PSG, RWA, RWR, VPSG
   • Sleep medicine, Diagnostics
   • https://doi.org…eep.2023.08.022

2. röntgen equivalent man(English)

   • sievert
   • Radiotherapy /radiation

3. RAS exchanger motif(English)

   • RAS
   • Cell biology
   • https://doi.org…0/cells10071831