How to say the vertical vowel extension line in Japanese?


I'm learning katakana these days and my book introduces the horizontal line
which is use to lengthen a vowel sound as in internet inta-netto

My book says this line is called yoko bou which I can find in the dictionary.

Then my book mentions that when writing in vertical script it is called tabe
bou. I cannot find this in the dictionary. I speak Chinese so I already know
about 横 horizontal and 纵 vertical. 纵 turns out to be tate in my dictionary.

So is tabe a typo/mistake or are tate and tabe both variants ? Or maybe tate
changes to tabe when followed by bou ?




_Bou_ is just the reading for 棒【ぼう】 "bar; pole". There are a few other names
for this mark, as detailed in the JA Wikipedia article at
[長音符](https://ja.wikipedia.org/wiki/%E9%95%B7%E9%9F%B3%E7%AC%A6), and also
some in the EN Wikipedia article at
[Chōonpu](https://en.wikipedia.org/wiki/Ch%C5%8Donpu):

  * 長音符【ちょうおんぷ】 -- "long sound mark"
  * 長音符号【ちょうおんふごう】 -- "long sound symbol"
  * 長音記号【ちょうおんきごう】 -- "long sound notation"
  * 音引き【おんびき】 -- "sound puller / lengthener"
  * 棒引き【ぼうびき】 -- "bar puller / lengthener"
  * 伸ばし【のばし】棒【ぼう】 -- "lengthener / stretcher bar"

As you noted, there are also:

  * 横【よこ】棒【ぼう】 -- "horizontal bar / pole"
  * 縦【たて】棒【ぼう】 -- "vertical bar / pole"

