There are multiple definitions:

1. fragmented conduction index(English)

   • sum of relative maxima and minima as morphological parameter of the P-wave
   • AF, ECG, ADI, PC, WI
   • Electrophysiology
   • https://doi.org….1038/srep26799

2. functional capacity index(English)

   • a multi-attribute index for measurement of functional outcomes following severe trauma
   • AIS
   • Injury, Post-traumatic state, Scoring systems/scales
   • https://doi.org…ury.2017.01.006

3. fast causal inference(English)

   • algorithm employed to identify causal features by applying causal graphs of interested variables
   • BP, ECG, PPG, PTT
   • Signal analysis
   • https://doi.org…med.2023.106900

4. food craving inventory(English)

   • CCK, CD36, ENaC, FAT, FFA, FFQ, FNS, FPD, GCCR, gLMS, GPCR, GPR120, LIPK, LIPM, LIPN, MAP, NEFA, ORN, SAFA
   • Nutrition, Gustatory system, Physiology
   • https://doi.org…srev.00061.2021