It can be any object that is above or below the horizontal from the perspective of a viewer.
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It is the alternate angle to the angle of elevation
The angle below horizontal that an observer must look to see an object that is lower than the observer. Note: The angle of depression is congruent to the angle of elevation (this assumes the object is close enough to the observer so that the horizontals for the observer and the object are effectively parallel; this would not be the case for an astronaut in orbit around the earth observing an object on the ground).
The angle of elevation is looking at an object above your line of sight.
you could do a model showing the angle of elevation and angle of depression of a building
Angle of depression is the angle between a horizontal line and the line joining the observer's eye to some object beneath the horizontal line. ^_^