Surface clutter refers to the unwanted noise or interference in a radar signal caused by objects in its field of view. To describe this interference, there are several synonyms that can be used, such as "false echoes," "clutter echoes," "ground echoes," "sea returns," "noise," and "garbage." False echoes are false targets that appear on the radar screen, making it difficult for operators to identify real targets. Clutter echoes refer to radar signals that are reflected back from objects such as buildings, vehicles, trees, or other structures, while sea returns are the reflections of the radar signal on the surface of water. Noise and garbage are general terms used to describe any unwanted signal on the radar screen.