What does the unusual expression "~~~" in R code do?

Question

Like in this code, what does "~~~" (three tildes) mean?

plot.ts(x1, ylim=c(-10,10), main=expression(omega==6/100~~~A^2==13))

Answer 1

From ?plotmath

x ~~ y put extra space between x and y

Three tilde characters puts even more space.

plot(0, main = a * b ~ c ~~ d ~~~ e, cex.main = 3)