International Signal Flag Set

International maritime signal flags are a universally recognized set of flags used for communication between ships at sea. Their usage is defined by the International Code of Signals (INTERCO), and signals made with these flags are called flag signalling. For example, a diving support vessel hoists the A flag to inform other vessels that it is currently conducting diving operations.
Additionally, special codes are used in yacht and dinghy races. For instance, the P flag means Prepare to sail, and the S flag means Shorten course.

International signal flags consist of 40 types in total: 26 alphabet letter flags, 10 numeral flags, 3 substitute flags, and 1 answering flag.
Among these, the Z flag shown in the photo is used as a signal to indicate the letter Z, and can also be used alone to mean I require a tugboat or, in fishing grounds, I am shooting my nets.
In Japan, due to the meaning associated with the flag, it is sometimes used to pray for victory when challenging a crucial match, such as in sports cheering, elections, or exams.

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