What is the name of the rope on which a flag is flown?

The correct answer is halyard. A halyard is a specific type of rope used for raising and lowering flags. It is typically attached to the flagpole and runs through a block or pulleys at the top of the pole, allowing for smooth operation when raising or lowering the flag. The terminology associated with flagpoles is standardized in nautical contexts, where the halyard serves a crucial role in ensuring that flags can be displayed properly and with respect.

While "hoist rope" is sometimes used, especially in different contexts, the term "halyard" is more widely recognized in relation to flags and is the preferred nomenclature in both naval and maritime settings. Other terms like "flag line" and "support line" do not specifically convey the function of raising and lowering flags and are not commonly used in flag etiquette or naval language. Thus, understanding the specific role of the halyard helps in appreciating the traditions involved in flag presentation and handling.