A diver down flag, or scuba flag, is a flag used to indicate that there is a diver below. It is red with a white 
stripe from the upper left corner to the lower right corner. It can be placed on a boat or on a surface marker buoy. (Practice about this choice of flag is not uniform worldwide. In some countries, the practice is to use the blue-and-white A-flag – see below Signal flag ALFA/ALPHA – instead.)
It is used to notify to any boats to steer clear for the safety of the diver.
The use of this flag is required by law or regulation in many US states and Canada, as well in several other countries in the world (eg. Italy).Usually the regulations require divers to display the flag and to stay within a specified distance of it when they are near the surface. As well there is often a larger zone around the flag where no boats are allowed to pass. Some states also prohibit the display of this flag when there is no diver in water.
Other uses
Today the red and white flag is so strictly associated with scuba diving that it is also used to indicate a place where there are services for divers, for example stores selling or renting diving equipment or scuba service stations. It may be seen on the windows or bumpers of cars belonging to divers.
This scuba divers dive flag license plate tag makes a great gift.
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