A numeral pennant is a type of flag or pennant that is used to represent a numerical value.
The numeral pennants in the International Code of Signals are a set of flags representing the digits 0 to 9.
They can be hoisted alone or in combination to represent multi-digit numbers. Ships use these flags to communicate numeric information, such as course, speed, distances, or any other relevant numerical data. The use of a standardized system like the International Code of Signals helps ensure clear communication between vessels of different nationalities and languages, enhancing safety and efficiency at sea.