What is this partial box with angled arrow icon called?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Sunrise at the Stream

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Chapters
00:00 Question
00:47 Accepted answer (Score 37)
01:11 Answer 2 (Score 36)
02:08 Thank you

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Full question
https://superuser.com/questions/1735927/...

Question links:
[image]: https://i.stack.imgur.com/PwHXI.png

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Tags
#microsoftoffice #icons

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