Current (and 7.0.0-tobe) versions do not say much:
23AF HORIZONTAL LINE EXTENSION
* used for extension of arrows
x (vertical line extension - 23D0)
If it is intended to be a variation selector (possibly prepended
instead of appended!), then using it with ⇒ should give longer double
arrow, and using it with ↦ should give a longer variant of ↦.
If it is a glyph, then what is the difference with U+2500 ─ ? It
looks like then any vertical-positioning distinction is trivially
understood from context…
Any thoughts? Thanks,
Ilya
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