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The Japanese Postal symbol consists of a capital letter T with a bar above it. If you hold down the ALT key and press in order 2-0-9, then let go of the ALT key this symbol will appear. Although it was not the intention of the programmers to create a Japanese postal symbol, it happened anyways.
The colours of the flag are based upon the colour metric of orange for 2, white for zero, and pink for 9.
Honestly, the code is loaded with serendipity. There are a bunch of odd ALT codes that made shapes, and ALT 209 just happens look like the Japanese postal code. Destiny, fate, chance...it is all just a pile of luck? The post office below in Wakayama Prefecture, which is in the Osaka-Kyoto region. On a personal note, Wakayama was where I first touched the Pacific Ocean.