A radar displays the locations of other objects relative to the player, usually based on a circular display, where the center represents the player, and each graphical 'blip' indicates how far away and what relative direction objects are to the player. Sophisticated radar displays will display different categories of objects with different colored or shaped 'blip' icons.
In the screenshot, we can see 2 red square 'blips', indicating the relative position of the 2 red cube GameObjects tagged
Cube near the player, and a yellow circle 'blip' indicating the relative position of the yellow sphere GameObject tagged
Sphere. The green circle radar background image gives the impression of ...