I think you are referring to the one which is the serpent and the staff, but I have no idea how that came to be a medical insignia.
That is an interesting insignia. This insignia has an eagle.
Insignia
INSIGNIA You are correct.
From a medical professional
Which insignia did you have in mind, since there's a few different insignia worn? There's rank insignia, branch insignia, and regimental crests.
A medical license may be used for practicing as a medical professional. The exact title of the medical professional and requirements for license vary by state and are mandated by the AMA.
How do I delete on my Insignia camcorder
Insignia is a noun.
professional
The plural noun is insignia.The singular noun is insigne.
The caduceus is the traditional doctor's symbol.
The title "Dr." should be used when addressing a medical professional.