I want to use a single Wingdings character in a graph, specifically I want the telephone icon as an axis tick label at the 0 position. The open parenthesis character corresponds to the telephone icon in the Wingdings character map, but when I use
xlabel(0 `"{fontface "Wingdings"}"')
I just get an ordinary open parenthesis, not the corresponding Wingdings character. The fontface command seems to be working, because when I use:
xlabel(0 `"{fontface "Comic Sans MS"}"')
I get an open parenthesis from in Comic Sans font.

Thanks,
Zachary