Japan and Japanese are unique. The way they hide information is also unique. I found this interesting piece of information in Instagram in a comment section.
OO that’s the way of hiding something they don’t want to mention or write.

All I know is using dashes to fill in something as fill in the blanks. I don’t think there’s a way like this to hide something written in Tamil or English or any other languages that belong to Indians.
If you know any, share your knowledge in the comment section so others get to know.

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