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radar

noun: a device that sends out radio waves for finding out the position and speed of a moving object (such as an airplane)
noun: a device or system consisting usually of a synchronized radio transmitter and receiver that emits radio waves and processes their reflections for display and is used especially for detecting and locating objects (as aircraft) or surface features (as of a planet)
often used figuratively in informal U.S. English

A career in politics wasn't even 'on my radar (screen)' at that point. [=I wasn't thinking at all about a career in politics]
an actor who has 'fallen off the radar' [=who has stopped being noticed or talked about]
He tried to stay 'under the radar' [='unnoticed'] as he went about his business.

(..) Oh. Ugh, so we meet again. - Very ingenious. - He pulled himself across the floor. - He did? - How else could he avoid the radar field? Yes, how else? Hmm. Of course, he would need a very slippery floor to do that. - Therefore, the wax. - The wax? (..)
1975 The Return of the Pink Panther
(..) is protected. And by forces more impenetrable than any army. Observe. Deactivate. Failing the radar shield, the slightest release of pressure in the weight of the diamond... and the would-be thief is a prisoner. A prisoner of (..)
1975 The Return of the Pink Panther