There are multiple definitions:

1. cyclin-dependent kinase inhibitor(English)

   • identical to CDKI
   • ALLN, BrdU, CDKI, OPC
   • Oncology
   • https://www.ncb….115.099325.pdf

2. central keratoconus index(English)

   • the ratio between mean radius of curvature in a peripheral placido ring and mean radius of curvature of central ring. It increases with the severity of central keratoconus
   • KI, BAD-D, Becc, BED, CBI, IHA, IHD, ISV, SKC, TBI, TKC
   • Ophthalmology, Ratio-based metric
   • https://doi.org…ijo.IJO_2111_20
   • https://doi.org…598-022-09160-6