[1] : WordNet (r) 2.0

swung dash
     n : a punctuation mark used in text to indicate the omission of
         a word

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

swung dash
     
         a character similar to tilde but appearing
        in the same vertical position as a dash, i.e. half way up
        rather than at the top like tilde.  ascii does not include a
        swung dash so tilde is used instead.
     
        it is commonly used for "approximates" or "is approximately
        equal to".
     
        1997-06-28
     
     
see also:
character tilde dash ascii 

Swung Dash >> S Words
Swung Dash, definition of term: Swung Dash
swung+dash_pag1.html

Swung >> S Words
Swung, definition of term: Swung
swung_pag1.html

Dash >> D Words
Dash, definition of term: Dash
dash_pag1.html