Liberty BASIC won't access symbol fonts like Wingdings with a FONT command. Instead, create the font by API. It is very easy.
BUTTON

'Use a symbol font on a button.
nomainwin
fontname$ = "Wingdings" + chr$(0)
height = 48
Calldll #gdi32, "CreateFontA", height as long,_
0 as long, 0 as long, 0 as long,_
0 as long, 0 as long, 0 as long, _
0 as long, _SYMBOL_CHARSET as long,_
0 as long,0 as long, 0 as long, 0 as long, _
fontname$ as PTR, hFont as ulong
button #1.b, "C",[quit],UL,10,10,80,80
open "test" for window as #1
print #1, "trapclose [quit]"
hButton=hwnd(#1.b)
calldll #user32, "SendMessageA", _
hButton as ulong, _
_WM_SETFONT as long,_
hFont as ulong, _
1 as long,_
result as long
wait
[quit]
calldll #gdi32, "DeleteObject", hFont as ulong, r as long
close #1:END
Graphics
'wingding font in graphicbox
nomainwin
fontname$ = "Wingdings" + chr$(0)
height = 48
Calldll #gdi32, "CreateFontA", height as long,_
0 as long, 0 as long, 0 as long,_
0 as long, 0 as long, 0 as long, _
0 as long, _SYMBOL_CHARSET as long,_
0 as long,0 as long, 0 as long, 0 as long, _
fontname$ as PTR, hFont as ulong
graphicbox #1.g, 10,10,80,80
open "test" for window as #1
print #1, "trapclose [quit]"
hBox=hwnd(#1.g)
calldll #user32, "GetDC",_
hBox as ulong, hDC as ulong
calldll #gdi32, "SelectObject", _
hDC as ulong, _
hFont as ulong,_
oldFont as long
#1.g "down;place 20 60"
#1.g "\C"
wait
[quit]
calldll #user32, "ReleaseDC",hBox as ulong,hDC as ulong, r as long
calldll #gdi32, "DeleteObject", hFont as ulong, r as long
close #1:END