Badge
A coat of arms or simple heraldic symbol, such as a shield.
Burgee
A burgee is a long, tapered flag or pennant that ends in a swallowtail (having two points, like that of a swallow’s tail). Burgees are often used by sailing clubs.
Canton
Any quarter of a flag, but commonly means the upper hoist (left) quarter,such as the field of stars in the flag of the United States or the Union Flag in the Australian Flag.
Charge
A figure or symbol appearing in the field of a flag.
Civil Flag
A civil flag is a National flag that is displayed on land by private citizens.
Crest
The design at the top of the coat-of-arms, above the shield.
Defacing
Defacing (which is NOT vandalizing) is when a flag is altered by adding writing, another emblem or drawing & so on.
Emblem
A device often used as a charge on a flag. It may be heraldic in origin or modern, for example the maple leaf on the Canadian Flag.
Filed
The background of a flag; the colour behind the charge(s)..
Fimbriation
A narrow edging or border, often in white or gold, on a flag to separate two other colors.
Final
A finial is a decorative element at the top of a flagpole such as a round top or an eagle or Ashok Stambh etc.
Flagpole / Flagstaff
The staff, flagstaff, or flagpole is the pole upon which the flag is being supported or hoisted.
Fly
The half or edge of a flag furthest away from the flagpole. This term also sometimes refers to the horizontal length of a flag.
Hoist
The half or edge of a flag nearest to the flagpole. This term also sometimes refers to the vertical width of a flag.
Lengh
the span of a flag along the side at right angles to the flagpole, which is basically the span starting from left to right.