In the plot environment, the "pch" parameter decides the symbol of your output. There are about 130 symbols hard coded and passed into "pch."
However, there are still some symbols that are not in these 130 pch's. For instance, there is no checkmark. To plot checkmark or other symbols, we can use symbol() in the expression() or quote() functions. For example:
plot(0, 0, main=bquote(symbol("\326")))
There are over 300 symbols that can be plotted using this way.
8 hours ago