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It is the name of a cat that survived 3 shipwrecks during World War II.
The original name of the ship’s cat was Oskar and is reported to serve during World War II with both the Kriegsmarine and the Royal Navy and survived the sinking of three ships. “Oscar” was derived from the International Code of Signals for the letter ‘O,’ which is code for “Man Overboard”(the German spelling, “Oskar,” was sometimes used since he was a German cat).