How to write rupee symbol on Y axis of ggplot2's bar graph
You can often get things like this to work on the Mac if you try out a different font. For example, this works on my system:
ggplot(data = fakeDF) + geom_point(mapping = aes(x = u, y = v)) + labs(x = "x_description", y = "\u20b9 y_description") + theme(text=element_text(family="Helvetica"))
I don't know enough about this to provide a systematic way to identify fonts that will work with a given Unicode symbol. For example, Times and Verdana fonts are installed on my system, but I couldn't get the Rupee symbol to work with those fonts.
This resource on Unicode and Mac fonts might be helpful.