There are multiple definitions:

1. reaction inhibiting substance(English)

2. right intercostal space(English)

   • LIS
   • Anatomy

3. radiologically isolated syndrome(English)

   • defined as incidentally identified white matter anomalies within the CNS that are suggestive of MS in healthy individuals who lack clinical symptomatology associated with CNS demyelination, after exclusion of other possible etiologies
   • CIS, MRI, MS, CNS
   • Brain (dys)function, Medical imaging
   • https://doi.org…000000000000102

4. Regensburg insomnia scale(English)

   • TQ
   • Sleep medicine, Scoring systems/scales, Auditory system
   • https://doi.org…155/2015/461090

5. reconfigurable intelligent surface(English)

   • a planar structure typically ranging in size from about 0.1 to 5 square meters, using advanced substances, called metamaterials, to reflect and refract electromagnetic waves
   • IoE, MIMO, SG
   • Magnetism, Communication, Signal analysis
   • https://doi.org…OC.2022.3196696
   • https://doi.org…OC.2021.3061778