Vexillological symbols

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.

Leadership	Civil	Duty
Onshore	Civil Flag	Service Flag
At Sea	merchant flag	service flag

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If three points are given in a line, it is called a national flag.

Symbol	Meaning	Symbol
	Civic Flag
	Service flag on land
	War flag on land
	Merchant flag
	Service flag at sea
	Naval flag of war
	Civic flag and service flag on land
	Service and war flag on land
	Merchant and Service Flag at Sea
	Civic flag and merchant flag
	Service flag on land and at sea
	War flag on land and at sea

Source: Wikipedia