Jim Allan answered Alan Wood's question:

> Alan Wood posted on U+23D0 VERTICAL LINE EXTENSION:
> 
> > Is it intended as a Unicode replacement for Vertical arrow extender in
> > Symbol font? 
> 
> Yes.
> 
> See http://std.dkuug.dk/JTC1/SC2/WG2/docs/n2508.htm for the proposal.
> 
> The Unicode manual should probably indicate this use as a note as a 
> service to creators of fonts.

It does:

http://www.unicode.org/charts/PDF/U2300.pdf

23D0 |  VERTICAL LINE EXTENSION
        * used for extension of arrows
        -> 23AF - horizontal line extension
        
--Ken


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