QUOTE(JohnS @ Mar 12 2007, 06:23 AM)

I always thought a tilde was like a turn in music?
the tilde definitely looks like the turn in music doesn't it? It's not really anything like the sign for a trill.
Yes, as Skylark says it is used in Spanish over the letter 'n' - to make it sound 'ny'; it is also found in Portugese to nasalise a vowel.
It seems it is also a sign in mathematics to indicate negation or inversion.
I am not sure I would have any idea what a 'swung dash' might signify

why not just 'a wavy line' ? Keep it simple !