There are multiple definitions:

1. stereolithography(English)

   • common 3D printing technique
   • FDM
   • Biophysics, Medical technology (assessment)
   • https://doi.org….1063/5.0011924

2. step through latency(English)

   • PA, PAT
   • Memory
   • https://doi.org…54.2021.1896502

3. semitendinosus [surgical] lengthening(English)

   • APT, KFD, STTX
   • Musculoskeletal system, Orthopedics
   • https://doi.org…309499020910978