There are multiple definitions:

1. Thai Red Cross(English)

   • PDEV, PCECV, PEP, PVRV, RFFIT, RVNA, WHO
   • Charity, Vaccination
   • https://doi.org…ine.2006.02.036

2. two-rod construct(English)

   • ASD, CoCr, LL, LT, MRC, PI, PJK, SVA, TK, UIV
   • Orthopedics, Spine (or spinal cord), Surgery
   • https://doi.org…nee.2017.02.005