What does this strange symbol ":>" in bash mean

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Track title: Secret Catacombs

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Chapters
00:00 Question
00:26 Accepted answer (Score 46)
01:06 Answer 2 (Score 29)
01:31 Answer 3 (Score 12)
05:17 Thank you

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Full question
https://superuser.com/questions/965870/w...

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Tags
#bash

#avk47