Now bonus Aviation trivia points to the first Freeper that can correctly answer the following:
Why was the Japanese Zero was called the "Zero"?....tic,tic,tic
On July 31, the aircraft was formally accepted for production as the Navy Type 0 Carrier Fighter Model 11. The popular name was Reisen (which was an abbreviation for Rei Sentoki, or Zero Fighter), so chosen for its type number which was 0, standing for the last digit of the current Japanese year, which was 2600 in the Japanese calendar.