Jisho

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人物証明書
Wikipedia definition
1. Blood chitBlood chit is a notice that is carried by the military, usually aircraft personnel, that displays messages aimed at the civilians that ask them to help the servicemember in case they are shot down. Alternative names are escape and identification flags. Chit (also 'chitty') is a British English term for a small document, note or pass; it is an Anglo-Indian word dating from the late 18th century, derived from the Hindi citthi.
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