Displays the available plotting marks. Where specified, the ‘rgr’ functions use a plus sign, pch = 3, as the plotting symbol, alternate plotting marks may be selected from this display. For example, pch = 1 results in an open circle, the R default, and pch = 4 results in a cross, ‘x’. For additional symbols available only in R (pch = 19:25) see points.
display.marks()