Question mark

????Greek question markinterrogation pointQuestion marks؟1st Infantry Brigade Headquarters? erotimatikoKai
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.wikipedia
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Semicolon

;؛ Semicolon [;]
It was adopted by Church Slavonic and eventually settled on a form essentially similar to the Latin semicolon.
Although terminal marks (i.e. full stops, exclamation marks, and question marks) mark the end of a sentence, the comma, semicolon and colon are normally sentence-internal, making them secondary boundary marks.

Question

answerquestionswh-question
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.

Armenian alphabet

ArmenianArmenian scriptՀ
In Armenian, the question mark takes the form of an open circle and is placed over the last vowel of the question word.

Irony punctuation

irony markAlcanter de Brahmpercontation point
This character can be represented using the reversed question mark found in Unicode as U+2E2E.
Both marks take the form of a reversed question mark, "⸮".

Alcuin

Alcuin of Yorkadvisor to CharlegmagneAlcuin’s
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 moodinterrogatives
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 Left Shift key
In GNOME applications on 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.
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

IPAPronunciationInternational Phonetic Alphabet (IPA)
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 ?

ASCII

US-ASCIIAmerican Standard Code for Information InterchangeASCII code
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

interobangInterröbanginverted version of the 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.

Exclamation mark

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

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.

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 clausenoun clause
The question mark is not used for indirect questions.

Unicode

Unicode StandardUnicode Transformation FormatThe Unicode Standard
In Unicode, it is encoded at.

Lynne Truss

Going LocoLynn TrussCutting a Dash
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.)