str_rank(r, r_d, symb = list(const = html_img(glyphicon("right_arrow"), "10px"), up = html_img(glyphicon("up_arrow"), "10px"), down = html_img(glyphicon("down_arrow"), "10px")))
const
), ascent (up
) and descent (down
)Concatenates the rank number with symbols indicating the progress since the last change.