A badge is a specific emblem or insignia that represents an organization or achievement, while a shield is a protective or defensive device typically shaped as a broad piece of metal. In a general context, a shield offers physical protection, while a badge serves as a symbolic identifier.
California Medical Association in 1939
The organization Carefirst BCBS is an American health insurance company that was founded in 1929 in Michigan, USA. BCBS stands for Blue Cross Blue Shield.
Blue Cross, now known as Blue Cross Blue Shield Association, uses the blueshield logo because when the company was originally started in 1929, it was a separate organization from the Blue Shield Organization, which was started 10 years later in 1939. It wouldn't be until 1982 that the two companies would merge.
The Blue Shield Association is a national organization which promotes itself and its member companies through its trademark and networking skills. The Blue Cross offers insurances along with its member corporations, within the domain of healthcare.
A shield is essentially a "daughterboard" of a PCB that has pins to match the female pin headers on a standard format Arduino board. You build your circuits/connections of sensors (switches, light, sound, temperature sensors, etc.) and outputs (LED's, displays, etc.) on a shield as an efficient way to mate the inputs/output connections to an Arduino board. A shield is not required but is highly advised as a way to insure solid connections and organization of connections. For more information see:
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Either buy one or take shield left half and shield right half to make a full shield.
shield of excellence 10.