The vision test involved a black vertical bar centered on a white vertical bar twice the width.
视觉测试包括一个置于白色竖条中间的黑色竖条，白竖条的宽度是黑竖条的两倍。
Vertical bar
原声例句
科学60秒-科学美国人 2020年11月合集
可汗学院：物理
I'm just doing these two upward vertical bars to show something that is parallel to the surface.
两条平行竖线是平行的符号平行于斜面。
流行文化
Vertical bars could go either way. A simple little hand thing sort of indicates pull.
唐：垂直条可以向任何方向移动。一个简单的小手表示拉动。
世界奇趣图谱
Imagine two blocks of wood lying horizontal to each other, attached to two vertical iron bars.
想象一下， 两块木头相互水平放置， 连接到两根垂直的铁条上。
中文百科
竖线
竖线（|）是一个字符，在数学上有各种各样的用途，包括用作表示绝对值，而在计算和编程中，以及一般的版式中，它有分隔的用途，与间隔号有相似之处。它在不同范畴有不同名称，如管道、谢费尔竖线等。
英语百科
Vertical bar 竖线
Some variants of the EBCDIC family of code pages such as EBCDIC 500 distinguished the broken bar from the solid vertical bar.
Additional related Unicode characters:
In LaTeX, the vertical bar can be used as delimiter in mathematical mode. The sequence \| creates a double vertical line (a | b \| c is set as 
). This has different spacing from \mid and \parallel, which are relational operators: a \mid b \parallel c is set as 
. In LaTeX text mode, the vertical bar produces an em dash (—), or one can use the \textbar command instead.
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