There are multiple definitions:

1. branched-chain fatty acid(English)

   • synthesized mainly by the skin and known to be a major component of vernix caseosa, and found in meconium
   • SFA
   • Clinical chemistry
   • https://doi.org…b013e318184d2e6

2. bifactor [model for] confirmatory factor analysis(English)

   • CFA, EDS-R, PPA
   • Statistics, Model(ing), Exercise & Training
   • https://10.1177…315125231218745