There are multiple definitions:

1. red fluorescent protein(English)

   • CFP, mRFP, YFP
   • Fluorescence, Proteins / proteomics

2. right frontoposterior(English)

   • fetal position
   • Obstetrics

3. restrictive filling pattern(English)

   • HF, LV, MR, EF, ARP
   • Cardiology
   • https://doi.org….1002/ejhf.2512
   • https://doi.org…2167(03)00003-9

4. request for proposal(English)

   • RFI, NIH, CCAS
   • Practical shorthand

5. Role Function-Preventive(English)

   • EF, GMB, MSQ, PBO, RFR
   • Headache, Preventive medicine
   • https://doi.org…147/JPR.S287781