The Box Drawings Light Vertical symbol (│). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Box Drawing.
The quickest way is to copy │ from this page and paste it anywhere. You can also insert it with its Unicode, HTML, or alt code listed above.
│ is U+2502 (decimal 9474).
Use │ in HTML to render │ on a web page.
On Windows you can type it with Alt+9474 (hold Alt and enter the number on the numeric keypad).
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