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In the International Code of Signals, the letter C followed by additional letters is specifically used to convey a request for assistance. This is part of a system designed to facilitate maritime communication, particularly in emergency situations where clarity and brevity are essential for safety. The code allows vessels to send standardized messages to alert others that they require help or support.

The significance of this designation lies in its ability to communicate urgency without the need for a lengthy verbal exchange, which can be vital in situations where time is of the essence. The letters following C can specify the nature of the assistance needed, making the message more precise in terms of what is required from the receiving party.

This use of C within the International Code of Signals is a critical tool for mariners in distress, ensuring they can effectively communicate their needs to nearby vessels or maritime authorities.