What shape is used for nun buoys in lateral marking?

Nun buoys are used in lateral marking to indicate safe navigation channels and are characterized by their distinct red triangular shape. This red color signifies that the buoy is marking the right side of the channel when approaching from the open sea or upstream, aligning with the general maritime practice known as the "red right return." The triangle shape helps mariners quickly recognize the type of buoy and its purpose while navigating.

The other buoy shapes serve different functions within the navigation system. For example, square buoys are typically used for different informational or regulatory purposes, while blue circles represent non-lateral marks indicating specific restrictions, such as mooring. Yellow diamonds may indicate special areas or dangers and thus are not used as lateral markers. Recognizing these specific shapes and their meanings is essential for safe and efficient navigation on the water.