There are multiple definitions:

1. guanosine 5'-diphosphate(English)

   • Abbreviation may be used in Am. Soc. Physiol. journals without definition.
   • Physiology, Biochemistry

2. gross domestic product(English)

   • ACCP, IARC, PATH, WHO
   • Financial issues

3. gamma-detecting probe(English)

   • may be applied for intraoperative use
   • SN, PBD
   • Biopsy, Lymphatic system/lymphoma, Medical imaging
   • https://doi.org…msy.2000.100722