Team India tied black band in the second consecutive WTC final, what is the reason behind it, why did the captain take this step

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The wait for the ICC World Test Championship final between India and Australia is over. This famous match started on 7th June, Wednesday. Indian team captain Rohit Sharma won the toss and chose bowling and while fielding came out wearing a black armband. Team India has come to play in the second consecutive World Test Championship final wearing such a black band.-AP