vexillologistA person that is an expert in flag design & history is called a "vexillologist."
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Flag Expert
A person that is an expert in studying flags.
John M. Hartvigsen created Utah's state flag and expert for making flags.
An Expert Aviator is called an "Ace".
A bully expert is called a bullnation
A cultures expert is called an ethnologist.
what ia an expert pilot called
The California flag is called the bear flag.
A grammar expert is called a grammatician or a grammarian.
Expert advice or expert guidance.
An expert in his field is often called a specialist or an authority.
It is called "Red Ensign". The Ontario's flag is called "Red Ensign".