Pennants/ Flags

The system of international maritime signal flags is a way of representing individual letters of the alphabet in signals to or from ships. It is a component of the International Code of Signals. more...

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There are various methods that the flags can be used as signals:

each flag spells out a letter of an alphabetic message.; individual flags have specific and standard meanings; for example, diving support vessels raise the \"A flag\" indicating their inability to move from their current location because they have a diver underwater.; one or more flags form a code word whose meaning can be looked up in a code book held by both parties. An example is the Popham numeric code used at the Battle of Trafalgar.; in yacht racing and dinghy racing, flags have other meanings; for example, the P flag is used as the \"preparatory\" flag to indicate an imminent start, and the S flag means \"shortened course\".;

NATO uses an extra set of flags to communicate specific types of messages.

Letters

* ↑  N and C together (No and Yes) is used as a distress signal.

Numbers

Other flags

Read more at Wikipedia.org