[R] Plot degree symbol by itself

[Andre Jung]

Dear all,

I'm trying to plot the degree symbol by itself between two square
brackets. I just want to have "K [°]". So far I got to:

expression(K ~ group("[",1*degree,"]"))
or
expression(K ~ group("[",1^o,"]"))

But it won't work without a number or letter.

Any suggestions?

Thanks,
andre