Which sign would indicate a "TW ending marker"?

A "TW ending marker" refers to a sign indicating the end of a taxiway, particularly when coming upon a runway. The correct indication for this type of marker would typically be a directional sign. Directional signs provide pilots with information on taxiway routes and facilitate navigation around the airport, including markers for the ends of different taxiways.

While location signs are used to provide information about a pilot's current position on the airport, and mandatory instruction signs relay important operational instructions like hold short instructions, they do not serve the purpose of indicating the end of a taxiway. Similarly, approach light signs clarify the airport's approach paths for landing aircraft rather than guiding them on the taxiways themselves. Thus, the right choice aligns with the fundamental role of directional signage in airport ground operations.