Question mark

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The question mark [ ?wikipedia
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Armenian alphabet

ArmenianArmenian scriptՓ
In Armenian, the question mark takes the form of an open circle and is placed over the last vowel of the question word.
[ ՞ ] The hartsakan nshan is used as a question mark.

Question

answerwh-questionquestions
Lynne Truss attributes an early form of the modern question mark in western language to Alcuin of York.
In languages written in Latin, Cyrillic or certain other scripts, a question mark at the end of a sentence identifies questions in writing.

Inverted question and exclamation marks

¡¿inverted exclamation mark
An interrogative sentence, clause, or phrase begins with an inverted question mark and ends with the question mark, as in:
The inverted question mark is a punctuation mark written before the first letter of an interrogative sentence or clause to indicate that a question follows.

Irony punctuation

irony markpercontation point(?)
The percontation point is analogous to the irony mark, but those are even more rarely seen.
Both marks take the form of a reversed question mark, "⸮".

Alcuin

Alcuin of YorkAlcuin’spoem on the Saints of York
Lynne Truss attributes an early form of the modern question mark in western language to Alcuin of York.
Alcuin is credited with inventing the first known question mark, though it didn't resemble the modern symbol.

Interrogative

interrogative sentenceinterrogative moodQuestions
The question mark [ ? ] (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates an interrogative clause or phrase in many languages.
In languages written in Latin or Cyrillic, as well as certain other scripts, a question mark at the end of the sentence identifies it as a question.

Shift key

Shift Shift shift" key
In GNOME applications on GNU Linux operating systems, it can be entered by typing the hexadecimal Unicode character (minus leading zeros) while holding down both Ctrl and Shift, I J mm.e.: Ctrl Shift B F . In recent XFree86 and X.Org incarnations of the X Window System, it can be accessed as a compose sequence of two straight question marks, i.e. pressing Compose ?
On the US layout and similar keyboard layouts, characters that typically require the use of the shift key include the parentheses, the question mark, the exclamation point, and the colon.

International Phonetic Alphabet

IPAPronunciationdiacritic
The question mark is used in ASCII renderings of the International Phonetic Alphabet, such as SAMPA, in place of the glottal stop symbol, (which resembles "?" without the dot), and corresponds to Unicode code point.
Some letters are neither: for example, the letter denoting the glottal stop, has the form of a dotless question mark, and derives originally from an apostrophe.

Wildcard character

wildcardwildcardswildcard characters
The question mark is often utilized as a wildcard character: a symbol that can be used to substitute for any other character or characters in a string.
In Unix-like and DOS operating systems, the question mark matches exactly one character.

ASCII

7-bit ASCIIAmerican Standard Code for Information InterchangeASCII printable characters
In computing, the question mark character is represented by ASCII code 63 (0x3F hexadecimal), and is located at Unicode code-point.

Chess annotation symbols

?!chess punctuation
In algebraic chess notation, some chess punctuation conventions include: "?" denotes a bad move, "??" a blunder, "?!" a dubious move, and "!?" an interesting move.
Question marks and exclamation points that denote a move as bad or good are ubiquitous in chess literature.

Interrobang

interobanginverted version of the interrobangpunctuation mark
Interrobang
The interrobang, also known as the interabang (often represented by ?! or !?), is a punctuation mark used in various written languages and intended to combine the functions of the question mark, or interrogative point, and the exclamation mark, or exclamation point, known in the jargon of printers and programmers as a "bang".

Regular expression

regular expressionsregexregexp
In the POSIX syntax for regular expressions, such as that used in Perl and Python, stands for "zero or one instance of the previous subexpression", i.e. an optional element.
A quantifier after a token (such as a character) or group specifies how often that a preceding element is allowed to occur. The most common quantifiers are the question mark, the asterisk (derived from the Kleene star), and the plus sign (Kleene plus).

Exclamation mark

exclamation point!exclamation marks
Exclamation mark
The exclamation mark is sometimes used in conjunction with the question mark.

Terminal punctuation

Terminal punctuation
In languages using the ISO basic Latin alphabet, terminal punctuation marks are defined as the period, the question mark, and the exclamation mark.

Ampersand

&& Ampersand (or "Wait") [&
A query string is usually made up of a number of different field/value pairs, each separated by the ampersand symbol, as seen in this URL:
The generic URL (Uniform Resource Locator) syntax allows for a query string to be appended to a file name in a web address so that additional information can be passed to a script; the question mark, or query mark, ?, is used to indicate the start of a query string.

Journalism

journalistreportagejournalistic
The question mark [ ? ] (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates an interrogative clause or phrase in many languages.

Punctuation

punctuation markpunctuation marksFrench
The question mark [ ? ] (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates an interrogative clause or phrase in many languages.

Content clause

indirect questiondeclarative content clausedirect question
The question mark is not used for indirect questions.

Unicode

Unicode StandardUU+
In Unicode, it is encoded at.

Lynne Truss

A Certain AgeLynee TrussTruss, Lynne
Lynne Truss attributes an early form of the modern question mark in western language to Alcuin of York.

Western culture

WesternWestern civilizationWest
Lynne Truss attributes an early form of the modern question mark in western language to Alcuin of York.

Language

languageslinguisticlinguistic diversity
Lynne Truss attributes an early form of the modern question mark in western language to Alcuin of York. The question mark [ ? ] (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates an interrogative clause or phrase in many languages.

Aelius Donatus

Donatus
(The punctuation system of Aelius Donatus, current through the Early Middle Ages, used only simple dots at various heights.)

Early Middle Ages

early medievalEarlyDark Ages
(The punctuation system of Aelius Donatus, current through the Early Middle Ages, used only simple dots at various heights.)