Follow-up Comment #14, bug #62923 (project groff):
I also found this on wikipedia
https://en.wikipedia.org/wiki/Symbol_(typeface)
The character at 0x60 does not appear in Unicode. It is described in the Adobe
map as "RADICAL EXTENDER", with the Adobe glyph name "radicalex", and is
mapped to the PUA code point U+F8E5. It is an over-bar for extending the
radical sign over the operands of the radical operator. Some versions of the
font implement this as a non-spacing character so that it can be combined
(like non-spacing diacritical marks) with the operands it covers. The Unicode
overbar character is shown here.
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