What signature in dope sheet?

Can anyone tell me what signature in dope sheet? and how to remove it?

it’s a marker. With it you can add a label to any frame so you later know which frame it was. By deafullt the text is just the number of the frame it was created on. You can also bind cameras to markers, so when time hits the marker camera changes.
To delete it just click on it and then press delete (who would have thought XD).

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Thank you. I got it