til·de 
(tĭldə)
(tĭldə)n.
The diacritical mark ( ~ ), used for example over the letter n in Spanish to indicate the palatal nasal sound (ny), as in cañón, "canyon," and over the vowels a and o in Portuguese to indicate nasalization, as in pão, "bread."
[Spanish, alteration of obsolete Catalan title, from Latin titulus, superscription.]