There are multiple definitions:

1. line-of-sight(English)

   • MIMO, SNR
   • Communication
   • https://doi.org…OC.2018.2819697

2. length of stay(English)

   • i.e. duration of hospital stay
   • LOHS, HLOS, ICULOS, OD
   • Hospital admission, Orthopedics
   • https://doi.org…309499018792742

3. lipooligosaccharide(English)

   • this structure determines IgM binding and complement activation
   • IgM, NT, NTHi, OM
   • Microbiology
   • https://doi.org…8/mBio.00079-12

4. light obscuration sensing(English)

   • DLS, HPH, LPT, OIW
   • Biomaterials
   • https://doi.org…bio.2021.09.038