In English, we have the interrobang -- ‽ (often represented by ?! or !?) -- which can express incredulity and surprise in-text. Does Spanish have an equivalent punctuation mark? If so, would it, like the exclamation point and question mark, require an antecedent at the beginning of a sentence?
This answer provides a possible answer to this question as well:
You can start with one sign (¡) and close with the other (?) if the meaning is mixed, but using both is preferred.
¡Que ha dicho qué?
!¿Que ha dicho qué?!
And according to Wikipedia, you can also use this form, although it is not considered standard:
⸘Que ha dicho qué‽
Interrobang is non existent in spanish. Its usage is incorrect, as the symbols is not defined in the Ortografía.
Starting with one symbol and closing with the other is the only correct form. It is indiferent which one you use to open and which one to close (Ortografía, 220.127.116.11, b), page 393)