Day beacons are indicated by small shapes of which color?

• A. Green squares
• B. Blue circles
• C. Yellow diamonds
• D. Red triangles

Answer: (D)

Day signals use simple visual cues in daylight to identify marks and their meaning. A red triangle is the standard small shape used to indicate a day beacon, chosen for quick recognition and a clear warning-oriented message in daylight conditions. The other color/shape options aren’t the day beacon signal in this context, as green squares, blue circles, or yellow diamonds are used for different kinds of marks or information and wouldn’t indicate a day beacon here. Therefore, the red triangle is the correct visual cue to look for in daylight.