interrobang
A combination of a question mark and an exclamation mark; ⟨!?⟩ or ⟨?!⟩.
rare
Interrobang — !?, ?!, or ‽ / What?! You’ve never heard of the interrobang!? Really? Well, now you have, so all is forgiven. An interrobang is […] used to end sentences where you really want both the exclamation point and the question mark. […] The word is used to describe both the two side by side (!? or ?!) or the combined symbol (‽).
Where it comes from
A blend of French (point d')interrogation (“question mark”) or the equivalent term in another Romance language + bang (“exclamation mark, exclamation point”), coined in a 1962 article in the journal TYPEtalks by American advertising executive Martin Kiehra Speckter (1915–1988), who invented the symbol.
Adapted from the Wiktionary entry interrobang (CC BY-SA 4.0).