There are multiple definitions:

1. left sacrotransverse position [of fetus](English)

   • RST
   • Obstetrics

2. laterally spreading tumor(English)

   • originally classified into 4 subtypes. Pseudo-depressed nongranular types (LST-NG-PD) are gaining attention because of their high malignancy potential
   • CRC, EMR
   • Gastroenterology, Oncology
   • https://doi.org…gie.2020.04.033

3. life-sustaining treatment(English)

   • Cdcd, NRP, OCS, OPO, uDCD
   • Transplantation, Ethics
   • https://doi.org….1111/ajt.15772

4. low sitting time(English)

   • IPAQ-SF, HST, LPA, LST, PA, ST
   • Exercise & Training
   • https://doi.org….1111/sms.14234