I've seen snippets like this:
(set-display-table-slot standard-display-table 'vertical-border (make-glyph-code ?┃))
That claim to make emacs use a prettier window divider character. However, standard-display-table is nil in a emacs24.4 -Q. How can I fix this?
The docs of standard-display-table refer to buffer-display-table which mentions that you can create display tables with make-display-table if necessary.
This means the following should work:
(let ((display-table (or standard-display-table (make-display-table))))
(set-display-table-slot display-table 'vertical-border (make-glyph-code ?┃))
(setq standard-display-table display-table))
You do not need to fiddle with a display table. Just customize face window-divider: M-x customize-face window-divider.
I use a Blue foreground attribute, for example. Here is a screenshot, with scroll bars turned off:
Oops. I see now that you are interested in TTY, not graphics. In that case, you can try customizing face vertical-border, giving it, for example, a width attribute value of narrow. Here is a screenshot of that:
