There are multiple definitions:

1. right sacrotransverse position [of fetus](English)

   • RSA, RSP
   • Obstetrics

2. rubrospinal tract(English)

   • originates in the red nucleus of the midbrain, decussates, and then descends in the lateral aspect of the spinal cord. Major afferents are from the cerebellar and cerebral cortices, and the rubrospinal tract projects to nuclei in the brain stem and cerebellum before reaching the spinal cord. The most important function of the rubrospinal tract is the control of muscle tone in flexor muscle groups. This system seems particularly important in the term newborn because of the impressive flexor tone in the limbs
   • Brain (dys)function, Spine (or spinal cord)
   • https://doi.org…42876-7.00030-2

3. rosuvastatin(English)

   • a novel, synthetic and potent HMG-CoA inhibitor
   • HMG-CoA, HPLC
   • Pharmacology / pharmaceutics
   • https://doi.org/10.1002/bmc.611