Plain English Meaning
Yellow signs with black writing that point you toward a place on the airport, like a runway or terminal. The name tells you where, and the arrow tells you which way to go.
Full Definition
Airport signs with a black inscription on a yellow background, used to indicate the direction to a specific destination on the airport such as a runway, terminal, cargo area, civil aviation area, military area, or fixed-base operator. The destination is identified by name and is followed by an arrow showing the direction of travel.
Context Anchor
Seen while taxiing on an airport, especially near intersections where a pilot must choose which way to turn.
Why Pilots Care
They prevent disorientation on the airport and reduce the of by providing directional information.