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Glcd_Init()
Glcd_Set_Font(@Character8x7, 8, 7, 32)
Glcd_Write_Text("°", 48, 1, 2)
...and there is a degree-symbol.
That is, the font supplied with the GLCD isn't limited to what's shaded in blue on the Tools -> Ascii Chart
To make the GLCD display a simple Degree Symbol has got to be the most difficult and frustratingly annoying thing, if not impossible.
And I have no idea why this is the case when ME sells temperature sensing equipment