The setting you are looking for is in lib/pref/font-gcu.prf
Stefan
I seem to recall finding out that this was buried in a file with a name
something like font-x11.prf for X11 -- thanks to helpful people in the
#angband channel.
That file defined alternative symbols or character codes to use for a
few terrain features. Copying the default file into my prefs directory
and removing those lines fixed them. (I then also fixed the colors so
I could tell dark and light green apart, and could tell orange from
dark brown.)
-s
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