There are multiple definitions:

1. near-infrared(English)

   • ICG, NIRAF, UV
   • Medical imaging

2. network identification by multiple regression(English)

   • derived from a branch of engineering called system identification
   • SOS
   • Statistics, Bioengineering
   • https://doi.org…science.1081900
   • https://doi.org…ormatics/btl003