There are multiple definitions:

1. keratoconus prediction index(English)

   • probability of keratoconus by analyzing anterior corneal topographic data
   • AAI, BFTA, CLMI, IAI, PPK
   • Ophthalmology
   • https://doi.org…ijo.IJO_2111_20

2. key performance indicator(English)

   • AR, DNN, DRL, eMBB, E2E, QoS, RAN, TSN, TTI, URLLC, VR
   • Communication
   • https://ieeexpl…ocument/9369424