: A Request for Proposals (RFP) or bid number, such as those issued by the Nebraska Department of Administrative Services or the State of Alaska .
: A specific product number for the laboratory chemical tert-Butyl bromoacetate sold by suppliers like Sigma-Aldrich . 124230
: A unique identifier for scientific papers or preprints, such as a bioRxiv preprint on skeletal muscle development or an MIT persistent URL for research on nanodiamonds. : A Request for Proposals (RFP) or bid