Origin: 1570–80; < Middle French < Late Latinheteroclitus < Greekheteróklitos, equivalent to hetero-hetero- + -klitos, verbid of klī́nein to bend, inflect
a symbol (∼) indicating equivalency or similarity between two values.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.