What is a alfa flag?

An alpha flag, also known as the "Alfa" flag, is a signal flag used in maritime communication. It is represented by a blue and white checkered pattern and signifies that a vessel is requesting assistance or that there is a diver in the water. The flag is part of the International Code of Signals, which is used by ships to communicate important information visually. Additionally, when displayed by a ship, it alerts other vessels to exercise caution in the area.