Terminology related to Symbols

Ensign : 

 An ensign is a national flag when used at sea, in vexillology, or a distinguishing token, emblem, or badge, such as a symbol of office in heraldry. The word has also given rise to the military rank of "ensign", a rank of junior officer once responsible for bearing the ensign.

Roundel: medal(पदक)

 
Insignia

Insignia or insigne pl -nia or -nias (in Latin, insignia is the plural of singular insigne: emblem, symbol, ensign, badge of honor) : a symbol or token of personal power, status or office, or of an official body of government or jurisdiction. An insignia is usually the emblem of a specific or general authority.

Typical examples of insignia are:

• Badges

• Cockades

• Coats of arms and Heraldry

• Ensigns

• Flags of a country or state

• Military aircraft insignia

• Military rank and unit markings:

• Other National Emblems

• Regalia
  • Crowns
  • Sceptres

• Roundels

• Seals

• Shoulder patch, or shoulder sleeve insignia (SSI)

Emblem

An emblem is an abstract or representational pictorial image that represents a concept, like a moral truth, or an allegory, or a person, like a king or saint