Definition: 504550: A chemical compound with an acid in its name. BCDO: Non-EU compliant database identifier (ID) format for identifiers. ECGP: International Electrical Code and Certificate of conformity number for electrical engineering products, systems or services. 2110448: A serial number assigned by the National Institute for Standards and Technology to a device that is intended to be used in a commercial context. 99: The first nine digits of an identification number issued by the National Agency of Health Insurance (NAHI), which identifies the health insurance coverage for which the ID is valid.