Variable: display-fill-column-indicator-character

display-fill-column-indicator-character is a customizable and buffer-local variable defined in C source code.

Documentation

Character to draw the indicator when display-fill-column-indicator is non-nil.

A good candidate is U+2502, and an alternative is (ascii 124) if the font of fill-column-indicator face does not support Unicode characters. See Info node (emacs)Displaying Boundaries for details.

This variable was added, or its default value changed, in Emacs 27.1.

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Probably introduced at or before Emacs version 27.1.

Source Code

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