This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A diacritical mark ( ~ ) placed over the letter n in Spanish to indicate the palatal nasal sound (ny), as in cañon, or over a vowel in Portuguese to indicate nasalization, as in lã, pão.

n. The grapheme of character ~.

n. A key found on some types of keyboards.

n. The character used to represent negation, usually ~ or ¬.

n. The accentual mark placed over n, and sometimes over l, in Spanish words [thus, ñ, �], indicating that, in pronunciation, the sound of the following vowel is to be preceded by that of the initial, or consonantal, y.

n. A diacritic mark (˜) placed over the letter n in Spanish to indicate that it is sounded as a palatal n, or very nearly like n followed by y, as in señor, pronounced sã˙nyôr′ , cañon, pronounced känyôn′ , and hence in English written canyon.

n. a diacritical mark (~) placed over the letter n in Spanish to indicate a palatal nasal sound or over a vowel in Portuguese to indicate nasalization

"The tilde is the ~, probably located at the upper left of your keyboard."

diacritic    diacritical mark   

ASCII    swung dash    hyphen   

twiddle    squiggle   

aptain    'black'    élan    c    ~    stylishness    ~*    disjunction    '~    baggage-car