There are multiple definitions:

1. insufficient sleep syndrome(English)

   • defined by hypersomnolence symptoms due to chronic sleep debt resulting from self-induced sleep restriction or wake extension. It is a distinct disorder with clearly defined diagnostic criteria under “central hypersomnolence disorders”. Diagnostic criteria include daily periods of an irrepressible need to sleep or daytime lapses into sleep for three months, with a duration of sleep shorter than expected for age, being present for at least three months. Additionally, it is required that symptoms are not better explained by another untreated sleep disorder, the effects of medications or drugs, or any medical, neurologic, or mental disorder. It is chronic and related to environmental and behavioral factors. Genetic factors could also be involved; aka “chronic insufficient sleep,” “voluntary sleep curtailment,” “sleep reduction,” “sleep restriction,” “inadequate sleep,” or “sleep deprivation”
   • CDC, ICSD, NCD
   • Sleep medicine
   • https://dx.doi.…4-0063.20180013

2. injury severity score(English)

   • one of the most widely used scoring systems in the trauma literature. It correlates well with several important trauma outcomes such as mortality and duration of hospitalization
   • MISS, AIS, CDR, GCS, ICP, ICU, IVH, LOS, MLS, MVC, PECARN, TBI
   • Injury, Scoring systems/scales, Quality and outcomes
   • https://doi.org…017.2.PEDS16419
   • https://doi.org…06612-9.00030-4

3. in situ septoplasty(English)

   • a type of external rhinoplasty surgery performed due to crooked nose
   • ECS
   • ENT, Surgery
   • https://doi.org…0266-017-0973-1

4. idiopathic short stature(English)

   • defined as a condition in which the height of the individual is more than 2 SD below the corresponding mean height for a given age, sex and population group, and in whom no identifiable disorder is present
   • HRQoL, QoLISSY, SGA
   • Pediatrics, Anatomy, Endocrinology
   • https://doi.org…2955-019-1118-9
   • https://doi.org…29738-7.00024-1

5. inferior sagittal sinus(English)

   • is a part of the superior group of dural venous sinuses, and as a member of the superficial cerebral venous system, it drains the superficial surfaces of both cerebral hemispheres
   • SSS
   • Anatomy, Brain (dys)function
   • https://doi.org…65377-0.00003-9