High-pitched signal

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Possible Answers:

BLEEP.

Last seen on: The Sun – Two Speed Crossword – Jul 22 2019

Random information on the term “BLEEP”:

A beep is a short, single tone, typically high-pitched, generally made by a computer or other machine. The term has its origin in onomatopoeia. The word “beep-beep” is recorded for the noise of a car horn in 1929, and the modern usage of “beep” for a high-pitched tone is attributed to Arthur C. Clarke in 1951.

In some computer terminals, the ASCII character code 7, bell character, outputs an audible beep. The beep is also sometimes used to notify the user when the BIOS is not working or there is some other error during the start up process, often during the power-on self-test (POST). A beep is also made when holding down too many keys at the same time, as the computer often cannot handle the processes.

The command-line interfaces of the ReactOS, PTS-DOS, and AROS operating systems include a beep command.A beep command is also part of ASCII’s MSX-DOS2 Tools for MSX-DOS version 2.

Beeps are also used as a warning when a truck, lorry or bus is reversing. It can also be used to define the sound produced by a car horn. Colloquially, beep is also used to refer to the action of honking the car horn at someone, (e.g., “Why did that guy beep at me?”), and is more likely to be used with vehicles with higher-pitched horns. “Honk” is used if the sound is lower pitched (e.g. Volkswagen Beetles beep, but Oldsmobiles honk[citation needed]. On trains, beeps may be used for communications between members of staff.

BLEEP on Wikipedia