r - LaTeX \bullet symbol in mtext -


i print symbol similar latex \bullet (a black circle) in plot margin text. have tried unicode equivalent u2022 prints out small empty square. symbol not listed in plotmath page.

here example: 

plot(0,0) mtext(side=2,at=0.25,text=bquote(y[paste(i,",",o)]),las=2)

i replace small "o" in margin text small black disc of same size.

thanks.

thanks @lyngbakr comment , after going through unicode characters, u25cf looks more similar \bullet. 

mtext(side=2,at=0.25,text=bquote(y[paste(i,",\u25cf")]),las=2)

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