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Everett True doesn't like whistling (July 26, 1919)
(lemmy.world)
A place to appreciate the twentieth century comic character Everett True of "The Outbursts of Everett True." Feel free to check out the sticky.
The sign was used by the Nazis, however the iron cross is older than them like alcoholicorn said. You can still see it on a decent amount of German military equipment.
Also not to mention in this context it's supposed to resemble the x mark you'd see portrayed on treasure maps.