This is a ggplot() theme with serif fonts and directed arrows.
Examples
# Set theme globally by
ggplot2::theme_set(ggserif())
# Or use it for a single plot
ggplot2::ggplot(iris, ggplot2::aes(x = Sepal.Length, y = Sepal.Width, colour = Species)) +
ggplot2::geom_point() +
ggplot2::theme_set(ggserif())