How can I avoid the "±" character disappearing from my script every time I restart the R session?

Question

I used the Plus-minus ( ±) sign several times according to the given script, inserting it directly. For instance:

paste("Mean", "SD", sep = " ± ")

However, when I restart my R session, a symbol appears instead ?, for example:

paste("Mean", "SD", sep = " ? ")

What am I doing wrong? should I use another method to enter this character in my R script?

Answer 1

Try the following:

paste("Mean", "SD", sep = " \U00B1 ")