? may derive from Qo, with the Q written over the o, an abbreviation of Latin quaestio (“question”), placed at the end of a question to mark it as such.
- Marks a preceding passage written in Latin script as a question.
- (comics) Used by itself to convey that a character is confused.
- Character #1: "I have no time to explain! Have you seen a Big Bad Wolf blowing down various houses?"
- Character #2: "?"
- For the reversed question mark used in some right-to-left languages (including Arabic and Persian), see ؟.
- A placeholder for an unknown word, phrase, text, or numerical value.
2009, Terry Stickels, Math Puzzles and Brainteasers, Grades 3-5: Over 300 Puzzles that Teach Math and Problem-Solving Skills, John Wiley & Sons, →ISBN, page 6:
- What is the next number in the sequence below?
- 1 4 9 16 25 36 ?
- (chess) In algebraic notation, marks a bad move.
- (programming) A wildcard for one character in query language.
- (programming) The ternary operator in some programming languages.
- (regular expressions) Detects zero or one occurences of the preceding element.
- The string
colou?r matches both "color" and "colour".
- (networking) In a URL, begins a query string (a series of data formatted as field-value pairs).
For quotations of use of this term, see Citations:?.
- ^ Alexander Humez, 1987, A B C et cetera: the life & times of the Roman alphabet
- Used in ¿ ?.
- (nonstandard) Marks a preceding passage as a question, without the starting ¿, as in English and other languages.
- Cómo estás? — How are you?
As SMS messaging and other forms of electronic communication have become more common, some Spanish-speakers use only ? for questions and ! for exclamations, leaving out the initial typographical mark. This is considered non-standard usage.