There are multiple definitions:

1. Beck depression inventory(English)

   • BAI, BSI, CFS, CIS, DAS, DISH, MASQ, SCL
   • Depression

2. bending deformation index(English)

   • Biophysics

3. Baseline Dyspnea Index(English)

   • useful for the assessment of dyspnea in COPD
   • 6MWD, COPD, FAS, FEV1, HRQoL, KSQ, ReAS, TDI
   • Pulmonology, Scoring systems/scales
   • https://doi.org…med.2021.106436

4. Baidu Index(English)

   • used to confirm correlation between COVID-19 case data and Chinese online data (public attention)
   • COVID-19, SMI
   • Virology, Pulmonology
   • https://doi.org…ubh.2021.755530

5. bad data injection(English)

   • CDS
   • Cognitive function, Machine learning
   • https://doi.org…OC.2023.3272577