There are multiple definitions:

1. triangular basis function(English)

   • FIR, MLP, RBF

2. time before failure(English)

   • MTBF, TTFF

3. truncal body fat(English)

   • BMI, DXA, FFMI, LDL, SDS, TLM
   • Adiposity
   • https://doi.org…al.pone.0190576

4. tumor blood flow(English)

   • a drainage theory presents an interesting hypothetical mode of tumor spread for hepatocellular carcinoma, and liver resection based on the TBF drainage model has been proposed
   • AR, HCC, NAR
   • Oncology, Hemodynamics
   • https://doi.org…595-022-02616-2