The vexillological or FIAV symbols are used in flag lore (vexillology) for standardized classification of flags. The system was developed by Whitney Smith and introduced by the Fédération internationale des Associations exillologiques (FIAV) in the early 1970s.
Theuse of a flag is illustrated with a grid symbol:
The upper row represents use on land, the lower row represents use at sea.
The left column stands for civilian use, middle for service and right for military.
|Onshore||Civil Flag||Service Flag|
|At Sea||merchant flag||service flag|
If three points are given in a line, it is called a national flag.