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.
in·ter·ro·bang also in·ter·a·bang (ĭn-těr'ə-bāng') n. A punctuation mark in the form of a question mark superimposed on an exclamation point, used to end a simultaneous question and exclamation.
[interro(gation point) + bang1, exclamation point (printers' slang).]