What is squawk 7500?

A code used by airplanes to say that there is an imminent hijacking. They do so by resetting their transponder to 7500.

Airplane Pilot: *squawks 7500*
ATC: oh shit shoot him down
Other ATC: why tho
ATC: he used his transponder to Squawk 7500
Other ATC: ok

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squawk 7500 - video