Final answer:
The blue-and-white International Code Flag A is a maritime signal flag used to represent the letter 'A' in the International Code of Signals.
Step-by-step explanation:
The blue-and-white International Code Flag A is a maritime signal flag. It is used to represent the letter 'A' in the International Code of Signals, which is a system of communication used by ships at sea. Each flag in the system represents a different letter or message.
Flags are an important form of communication in maritime settings, where spoken language may not be understood due to language barriers or distance. By using flags like the blue-and-white International Code Flag A, ships can communicate with each other to convey important information or messages.