Add a bold female symbol to ggplot2 using annotate

Question

I'm trying to use the female symbol, ♀ in my plot. It's pretty faint (well, it looks faint on my actual graph), so I was hoping to make it bold face.

df <- data.frame(x = c(0, 1), y = c(0, 1))
ggplot(df, aes(x, y)) + geom_point() +
   theme_bw() +
   annotate("text", x = 0.5, y = 0.7, label = "2016 ♀", 
   size = 7, hjust = 0, colour = "grey50")

I've tried the following, but none seem to work:

ggplot(df, aes(x, y)) + geom_point() +
   annotate("text", x = 0.5, y = 0.7, label = "2016~bold(♀)", 
   size = 7, hjust = 0, parse = TRUE) 

# error message: Error in parse(text = as.character(lab)) : <text>:1:11: unexpected '<'
#1: 2016~bold(<
              ^

ggplot(df, aes(x, y)) + geom_point() +
   annotate("text", x = 0.5, y = 0.7, label = "2016~bold(u2640)", 
   size = 7, hjust = 0, parse = TRUE) 

ggplot(df, aes(x, y)) + geom_point() +
   annotate("text", x = 0.5, y = 0.7, label = "2016~bold(\u2640)", 
   size = 7, hjust = 0, parse = TRUE) 

I also found this post, but I'm not sure if I can modify the following code to work within ggplot?

plot(df)
text( locator(1), "\\VE", vfont=c("sans serif","bold"), xpd=TRUE)  # Venus 

Answer 1

@Axeman's comment helped me find an answer - I didn't realize you could load in other packages to get more fonts for ggplot2. Thanks! I used the following code:

install.packages("extrafont")
library(extrafont)
font_import() # Prepare for this to take several minutes
loadfonts(device = "win")

ggplot(df, aes(x, y)) + geom_point() +
   theme_bw() +
   annotate("text", x = 0.5, y = 0.7, label = "2016 ♀", 
   size = 7, hjust = 0, colour = "grey50", family = "Calibri", fontface = "bold")