There are multiple definitions:

1. ultrasound(English)

   • IVUS, QUS
   • Bioengineering, Echography/ultrasound, Doppler technique, Medical imaging

2. unconditioned stimulus(English)

   • associated with increased cortical gain in early sensory brain areas
   • CS
   • Brain (dys)function, Behavior(al science)
   • https://doi.org…CI.0977-18.2018

3. undetermined significance(English)

   • ASCUS
   • Pathology

4. uncertainty stress(English)

   • moderation analysis indicated that the association between the US and depressive symptoms was significantly modified by family relationships
   • ACE, BCE
   • Stress (test), Depression, Psychology
   • https://doi.org…ubh.2021.757466