There are multiple definitions:

1. tetraphenylphosphonium triiodide(English)

   • a pure molecular crystal containing a photolabile anion, triiodide (I3−), and a complex organic counterion
   • TBAT, TEAT
   • Biochemistry, Materials science
   • https://doi.org…science.1127826

2. ThinPrep Pap test(English)

   • ASC-H, HPV, hrHPV, Pap
   • Triage, Gynecology, Genitals, Oncology, Cytometry / cytology
   • https://doi.org…858/132.12.1874