There are multiple definitions:

1. corrected sinus node recovery time(English)

   • NSR, SNRT
   • Electrophysiology, Cardiology

2. choice serial reaction time(English)

   • within cognitive and behavioral research, this task is widely recognized as a valuable test of attention in rats
   • 5-CSRT, CSRTT
   • Behavior(al science), Cognitive function, Experimental animal
   • https://doi.org…rev.2016.08.027