How do you send numbers in semaphore?

To send numbers using semaphore, you typically use a flag signaling system, where each number corresponds to a specific position of the flags. For example, the flags can be held at various angles to represent different digits, with each angle corresponding to a number from 0 to 9. The sender displays each number sequentially, and the receiver interprets the flag positions to decode the message. This method relies on clear visibility and understanding of the flag positions for effective communication.