What is the significance of the number and degree symbol associated with the black arrow on airport diagrams?

The association of the number and degree symbol with the black arrow on airport diagrams specifically indicates the variation in obstacle height in relation to the runway. This is vital for pilots and air traffic controllers, as it provides crucial information regarding potential obstructions in the vicinity of the airport. Understanding obstacle heights helps in ensuring safe takeoff and landing procedures, enabling pilots to make informed decisions regarding altitude and approach paths.

Expecting clarity when navigating around an airport, pilots rely on this information to avoid any unintended encounters with obstacles during critical phases of flight such as takeoff and landing.