There are multiple definitions:

1. European Research Council(English)

   • Evidence based medicine, Organizations (documentation), Financial issues
   • https://erc.europa.eu/homepage

2. extrachromosomal circle of rDNA(English)

   • CR
   • Genetics

3. European Resuscitation Council(English)

   • aims to preserve human life by making high-quality resuscitation available to all
   • CPR, NTTT, ILCOR, ALS, BLS, NRR
   • Emergency medicine, Organizations (clinical)
   • https://www.erc.edu/

4. effort-related choice(English)

   • Decision making
   • https://doi.org…3041-019-0441-8

5. endogenous reference compound(English)

   • AAS, ABP, EBP, GC-MS, WADA, MRR
   • Biochemistry, Sports medicine, Forensic medicine
   • https://doi.org/10.1002/dta.3250