What is a vertical tab?

Question

What was the original historical use of the vertical tab character (\\v in the C language, ASCII 11)?

Did it ever have a key on a keyboard? How did some

Answer 1

I have found that the VT char is used in pptx text boxes at the end of each line shown in the box in oder to adjust the text to the size of the box. It seems to be automatically generated by powerpoint (not introduced by the user) in order to move the text to the next line and fix the complete text block to the text box. In the example below, in the position of §:

"This is a text §
inside a text box"