There are multiple definitions:

1. scapholunate advanced collapse(English)

   • the most common cause of osteoarthritis involving the wrist
   • DISI, OA, CPPD, SNAC, VISI
   • Musculoskeletal system, Diagnostics, Medical imaging
   • https://doi.org…3244-014-0337-1

2. single-likelihood ancestor counting(English)

   • HKY, ICTV, REL, FEL
   • Virology
   • https://doi.org…28/JVI.01055-13